In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

WASHINGTON (Reuters) - The FBI arrested 150 people across the United States on charges of holding children against their will for prostitution, a three-day weekend sweep that officials on Monday called the largest-ever operation against child sex-trafficking. 
  
 The suspects, whom the FBI referred to as "pimps," were arrested in 76 U.S. cities and are expected to face state and federal charges related to sex crimes and human trafficking, FBI and U.S. Justice Department officials said at a news conference. 
  
 FBI agents and local police recovered 105 children during the operation at truck stops, motels, casinos and other places where they were forced to work as prostitutes, officials said. 
  
 Of the 150 suspects, 18 were arrested by agents based in Detroit, 17 by agents from San Francisco and 13 by Oklahoma City agents, the FBI said. 
  
 The FBI said the suspects were not part of the same operation. It said some belonged to organized crime while others acted alone. The bureau did not immediately release a list of the suspects. 
  
 The FBI typically does not investigate adult prostitution, leaving it as a state and local matter, but in recent years it has made child prostitution a priority in a program the FBI calls Operation Cross Country. The program includes highway billboards asking people to call the FBI with tips. 
  
 About 1,350 people have been convicted as part of the program and at least 10 of them were sentenced to life in prison, officials said. 
  
 The latest sweep was the seventh and largest under Operation Cross Country, they said. 
  
 Children who are most vulnerable to being exploited for sex crimes are between 13 and 16 years old without strong ties to family members, officials said. 
  
 "We are trying to take this crime out of the shadows and put a spotlight on it," said FBI Assistant Director Ronald Hosko. 
  
 (Reporting by David Ingram; Editing by Howard Goller and Bill Trott) ||||| Story highlights The Bay area and Detroit have the most arrests and child rescues 
  
 The FBI says the three-day undercover operation is its biggest to date 
  
 105 children across the country are rescued in the nationwide operation 
  
 The ages of the children involved range from 13 to 17 
  
 They are mostly teenage girls, often from broken homes where no one misses them. Their world is one of drugs and abuse -- emotional and physical -- in which they are forced to sell their bodies. 
  
 In announcing the FBI's latest crackdown on child prostitution, officials Monday described a dark underside of society that has grown through Internet sites that provide pimps easy access to johns in hotels, motels, at truck stops and just about anywhere else. 
  
 The nationwide operation over the weekend resulted in 150 arrests, with 105 children between the ages of 13 and 17 rescued, according to Ron Hosko, assistant director of the FBI's Criminal Investigative Division. 
  
 Overall, the three-day undercover Operation Cross Country took place in 76 cities and involved 230 law enforcement units, Hosko told a news conference. 
  
 It was the largest such sweep to date, he said, with 28 searches and 129 seizures of cash, drugs, vehicles and firearms. Those arrested face a variety of federal and state charges, including pimping. 
  
 JUST WATCHED 105 rescued in sex trafficking ring bust Replay More Videos ... MUST WATCH 105 rescued in sex trafficking ring bust 01:57 
  
 JUST WATCHED Video shows undercover sex ring bust Replay More Videos ... MUST WATCH Video shows undercover sex ring bust 03:26 
  
 JUST WATCHED Human trafficking survivor: Go after johns Replay More Videos ... MUST WATCH Human trafficking survivor: Go after johns 04:05 
  
 This seventh iteration of Operation Cross Country also was the most successful, with a 30% to 40% increase in "identifying both victims and pimps" compared with previous operations, Hosko said. 
  
 He credited the success in part to an expansion of the probe to websites such as www.backpage.com, which he called a forum "where pimps and exploiters gather." 
  
 Authorities also have learned more about how the market thrives. For example, Hosko explained that major sporting events such as the Super Bowl and the NCAA Final Four attract tens of thousands of visitors with money who want to party, and pimps with prostitutes ready to cash in. 
  
 "We have had children recovered from each of those events, multiple children from each of those events in the past," he said. 
  
 While technology has changes methods of procurement, the underlying demographics of the child victims of the prostitution industry remain little changed -- young girls around 13 to 16 years old with few or no family ties. 
  
 "That tends to be the age that many of us as loving and caring parents occasionally find some differences with our teenage daughters, and exploiters will exploit that gap," Hosko said. 
  
 A breakdown of cities where the latest arrests took place, and where child prostitutes were recovered, reveals some unexpected findings. 
  
 The San Francisco-Oakland region in California had 17 arrests and 12 recovered child prostitutes, while Detroit, which just declared itself bankrupt, had 18 arrests and 10 rescued children. 
  
 Meanwhile, New York City had none of either, Las Vegas had one of each and New Orleans had five arrests and four recovered children, compared with 13 arrests and three child prostitute rescues in Oklahoma City. 
  
 "This operation serves as a reminder that these abhorrent crimes can happen anywhere," Hosko said. 
  
 Operation Cross Country is part of the FBI's Innocence Lost National Initiative, which seeks to identify children lured or forced into prostitution and remove them from risk, according to Hosko. 
  
 The circumstances of the situation make finding victims especially difficult, he explained. 
  
 "Commonly some of these children have stepped away from their families," he said, adding that "there is no one to call and report 'my daughter is missing.'" 
  
 Other major problems are the culture of abuse, both physical and emotional, and the drug use prevalent in child prostitution. 
  
 "We have victims whose new normal is abuse and is drug-infected," Hosko said, explaining there is an environment of instability in which "the expectation of somebody who cares about them may last for 30 minutes or an hour before the abuse starts again." |||||
The FBI has completed "Operation Cross Country," and it was a campaign that truly lived up to its name: The bureau today announced that 105 children have been rescued from forced prostitution following the arrests of 150 people in 76 US cities. It's the biggest operation to date under the FBI's "Innocence Lost" umbrella, which has saved 2,700 children over the last decade, reports the AP. It's actually the seventh "Operation Cross Country" to occur, notes CBS News. CNN shares some more numbers: Those rescued were between the ages of 13 and 17, and 230 law enforcement units took part. Reuters reports that the three-day operation took agents and local police to racetracks, truck stops, motels, and casinos.