(CNN) Police and CNN have issued an all-clear message after the network's New York offices and studios were evacuated Thursday night because of a phoned-in bomb threat. 
 
 "The NYPD has now given us the all clear, and employees have been permitted to return to the building,"CNN Worldwide president Jeff Zucker said in an internal memo to staff. "The building is secure and safe for everyone to return in the morning." 
 
 "We appreciate the swift action by the local authorities, and the patience and professionalism of all the employees who were impacted." 
 
 The threat was not substantiated, the New York Police Department tweeted. 
 
 The threat came Thursday night when a caller indicated there were five devices in the building, according to a law enforcement source. 
 
 Read More ||||| New York City police officers clear the scene after a report of a possible suspicious package was called in at the Time Warner Center Thursday, Oct. 25, 2018, in New York. The NYPD had said it had evaluated... (Associated Press) 
 
 New York City police officers clear the scene after a report of a possible suspicious package was called in at the Time Warner Center Thursday, Oct. 25, 2018, in New York. The NYPD had said it had evaluated the packages "as a precaution" on Thursday night. (AP Photo/Craig Ruttle) (Associated Press) 
 
 WASHINGTON (AP) — Federal authorities took a man into custody Friday in Florida in connection with the mail-bomb scare that earlier widened to 12 suspicious packages, the FBI and Justice Department said. 
 
 The man was identified by law enforcement officials as Cesar Sayoc, 56, of Aventura, Florida. He was arrested at an auto parts store in the nearby city of Plantation. 
 
 Court records show Sayoc has a history of arrests. 
 
 Law enforcement officers were seen on television examining a white van, its windows covered with an assortment of stickers, in the city of Plantation in the Miami area. Authorities covered the vehicle with a blue tarp and took it away on the back of a flatbed truck. 
 
 The stickers included images of American flags and what appeared to be logos of the Republican National Committee and CNN, though the writing surrounding those images was unclear. 
 
 President Donald Trump said he expected to speak about the investigation at a youth summit on Friday. 
 
 The development came amid a coast-to-coast manhunt for the person responsible for a series of explosive devices addressed to Democrats including former President Barack Obama, former Vice President Joe Biden and Hillary Clinton. 
 
 Law enforcement officials said they had intercepted a dozen packages in states across the country. None had exploded, and it wasn't immediately clear if they were intended to cause physical harm or simply sow fear and anxiety. 
 
 Earlier Friday, authorities said suspicious packages addressed to New Jersey Sen. Cory Booker and former National Intelligence Director James Clapper — both similar to those containing pipe bombs sent to other prominent critics of President Donald Trump— had been intercepted. 
 
 Investigators believe the mailings were staggered. The U.S. Postal Service searched their facilities 48 hours ago and the most recent packages didn't turn up. Officials don't think they were sitting in the system without being spotted. They were working to determine for sure. The officials spoke to The Associated Press on condition of anonymity to discuss an ongoing investigation. 
 
 The FBI said the package to Booker was intercepted in Florida. The one discovered at a Manhattan postal facility was addressed to Clapper at CNN's address. An earlier package had been sent to former Obama CIA Director John Brennan via CNN in New York. 
 
 Attorney General Jeff Sessions said Friday the Justice Department was dedicating every available resource to the investigation "and I can tell you this: We will find the person or persons responsible. We will bring them to justice." 
 
 Trump, on the other hand, complained that "this 'bomb' stuff" was taking attention away from the upcoming election and said critics were wrongly blaming him and his heated rhetoric. 
 
 Investigators were analyzing the innards of the crude devices to reveal whether they were intended to detonate or simply sow fear just before Election Day. 
 
 Law enforcement officials told The Associated Press that the devices, containing timers and batteries, were not rigged to explode upon opening. But they were uncertain whether the devices were poorly designed or never intended to cause physical harm. 
 
 Most of those targeted were past or present U.S. officials, but one was sent to actor Robert De Niro and billionaire George Soros. The bombs have been sent across the country - from New York, Delaware and Washington, D.C., to Florida and California, where Rep. Maxine Waters was targeted. They bore the return address of Florida Rep. Debbie Wasserman Schultz, the former chairwoman of the Democratic National Committee. 
 
 The common thread among the bomb targets was obvious: their critical words for Trump and his frequent, harsher criticism in return. 
 
 Trump claimed Friday he was being blamed for the mail bombs, complaining in a tweet sent before dawn: "Funny how lowly rated CNN, and others, can criticize me at will, even blaming me for the current spate of Bombs and ridiculously comparing this to September 11th and the Oklahoma City bombing, yet when I criticize them they go wild and scream, 'it's just not Presidential!'" 
 
 The package to Clapper was addressed to him at CNN's Midtown Manhattan address. Clapper, a frequent Trump critic, told CNN that he was not surprised he was targeted and that he considered the actions "definitely domestic terrorism." 
 
 Jeff Zucker, the president of CNN Worldwide, said in a note to staff that all mail to CNN domestic offices was being screened at off-site facilities. He said there was no imminent danger to the Time Warner Center, where CNN's New York office is located. 
 
 At a press conference Thursday, officials in New York would not discuss possible motives or details on how the packages found their way into the postal system. Nor would they say why the packages hadn't detonated, but they stressed they were still treating them as "live devices." 
 
 The devices were packaged in manila envelopes and carried U.S. postage stamps. They were being examined by technicians at the FBI's forensic lab in Quantico, Virginia. 
 
 The packages stoked nationwide tensions ahead of the Nov. 6 election to determine control of Congress — a campaign both major political parties have described in near-apocalyptic terms. Politicians from both parties used the threats to decry a toxic political climate and lay blame. 
 
 Trump, in a tweet Thursday, blamed the "Mainstream Media" for the anger in society. Brennan responded, tweeting that Trump should "Stop blaming others. Look in the mirror." 
 
 The bombs are about 6 inches (15 centimeters) long and packed with powder and broken glass, according to a law enforcement official who viewed X-ray images. The official said the devices were made from PVC pipe and covered with black tape. 
 
 The first bomb discovered was delivered Monday to the suburban New York compound of Soros, a major contributor to Democratic causes. Soros has called Trump's presidency "dangerous." 
 
 ___ 
 
 Associated Press writers Laurie Kellman, Ken Thomas, Jill Colvin and Chad Day in Washington and Jim Mustian, Deepti Hajela, Tom Hays and Michael R. Sisak in New York contributed to this report. 
 
 ___ 
 
 For the AP's complete coverage of the mail-bomb scare: https://apnews.com/PipeBombAttacks ||||| There have been no reported injuries or deaths stemming from the mailed devices, and authorities have not yet given any details about suspects or a motive. | Spencer Platt/Getty Images bomb threat Here are all the targets of the potential explosives so far 
 
 Authorities have arrested Cesar Sayoc, a 56-year-old Florida man, on suspicion that he sent over a dozen potential explosive devices to prominent liberal figures and CNN's New York studios, and the FBI has warned that more could still be discovered. 
 
 President Donald Trump has called for bipartisan unity and an end to political violence, even as his critics have said he needs to take more responsibility for his own heated political rhetoric. 
 
 Story Continued Below 
 
 There have been no reported injuries or deaths from the devices. 
 
 Here's a list of the 14 devices that have been found so far and who they were addressed to: 
 
 George Soros 
 
 The first device was discovered in Soros' mailbox Monday at his suburban home outside New York City. Officials say it was likely delivered by hand rather than mail, allowing it to reach its destination undetected. 
 
 The Clintons 
 
 A Secret Service agent screening Bill and Hillary Clinton's mail found the device that was address to their home in Chappaqua, New York. Like several others, the package's return address listed Rep. Debbie Wasserman Schultz (D-Fla.), whose name was misspelled. 
 
 The Obamas 
 
 A package almost identical to the one found at the Clintons' home was sent to Barack and Michelle Obama's house in the Kalorama neighborhood of Washington. It was also intercepted by Secret Service before making it to the Obamas. 
 
 CNN and John Brennan 
 
 CNN's New York Studio in the Time Warner Building was evacuated in the middle of Poppy Harlow and Jim Sciutto's live coverage of the devices sent to the Clintons and the Obamas. The package delivered to the Time Warner Building was addressed to former CIA Director John Brennan, who has appeared on CNN criticizing Trump. 
 
 Eric Holder and Debbie Wasserman Schultz 
 
 The packages listed Wasserman Schultz in the return address, and one made it back to her Florida office. The package was incorrectly addressed to former Attorney General Eric Holder and was redirected to Schultz. 
 
 Rep. Maxine Waters 
 
 Two devices were addressed to Waters (D-Calif.), who has been a staple in Trump's attacks on Democrats during his rallies. One device was addressed to Waters' office in Washington, and the other to California, but both were stopped in screening facilities far from her offices. 
 
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 Robert De Niro 
 
 A device addressed to De Niro's Manhattan production offices was found by his office's security personnel, police reported Thursday morning. Though not an elected official, the film star has openly criticized Trump in the past. 
 
 Joe Biden 
 
 Authorities are investigating two packages sent to the former vice president that were intercepted at Delaware mail facilities, one in New Castle and one in Wilmington. 
 
 Cory Booker 
 
 A suspicious package bound for Democratic Sen. Cory Booker's Camden, N.J., office was discovered in Florida on Friday morning. 
 
 James Clapper 
 
 Another package was discovered in New York City on Friday bound for the former director of National Intelligence. Clapper has been one of the most outspoken critics of the Trump administration. 
 
 Kamala Harris 
 
 A postal employee in a Sacramento, California, mail facility noticed a package addressed to Sen. Kamala Harris (D-Calif.) similar to those containing explosives and flagged it for FBI inspection, Harris' office said. 
 
 Tom Steyer 
 
 Another billionaire Democratic philanthropist, Tom Steyer, was targeted by a suspicious package that was caught in Burlingame, California. Steyer has spent millions advocating for Trump's impeachment.
– CNN says its New York offices and studios have been given the all-clear after a bomb threat was phoned in Thursday night. The threat at Manhattan's Time Warner Center forced the evacuation of the facility and the closure of part of West 58th Street to vehicle and pedestrian traffic, the New York Post reports. Police say a man with a southern accent called CNN at around 10pm and said five bombs had been placed in the building, reports the AP. Fire alarm bells rang in the newsroom and Don Lemon's CNN Tonight, which had been on a commercial break, ceased broadcasting as the network switched to taped programming. After around 30 minutes, Lemon and Brian Stelter resumed broadcasting from outside the building. "We were told to evacuate the building and to do it as soon as possible," Lemon told viewers. "We grabbed what we could and got out of the building and now, we are standing outside of the building." After the all-clear was given, CNN Worldwide President Jeff Zucker thanked authorities for the swift action and praised the "patience and professionalism" of staff. (CNN had to evacuate the facility after a suspicious device was found in October.)