Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Police are now searching for a possible suspect in a string of shooting deaths in Tampa's Seminole Heights neighborhood after video emerged from just before the latest killing. 
  
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 Four people have been shot and killed in Seminole Heights in just six weeks, according to police. After the first killing, the Oct. 9 shooting of 22-year-old Benjamin Mitchell, police released surveillance video of an individual repeatedly flipping and staring at a cellphone shortly after Mitchell was killed, labeling the subject as a person of interest. 
  
 Tampa Police Department 
  
 Police are now considering that individual a suspect after video taken before the killing of 60-year-old Robert Felton on Tuesday morning appears to show the same person, interim Tampa Police Chief Brian Dugan said at a press conference Wednesday afternoon. 
  
 The person in the video, taken at 4:51 a.m. Tuesday, "moments before" Felton was killed, appears to have the same gait and manner of dress as the individual in the earlier video, Dugan said. After Felton was shot, witnesses described the suspect as a black man with a tall, thin build and dressed in all black clothing, Dugan said. 
  
 Tampa Police Department 
  
 He said the person of interest was "nonchalantly walking" in both videos, saying the individual may be "able to flip a switch and go out and murder someone," based on the person's casual manner. 
  
 "Look how they're looking at their phone," Dugan said, adding that the individual could be "able to put that away, hit a switch and go out and gun someone down." 
  
 Watch this video. Pay attention to the walk. Pay attention to the way he flips his phone. If you recognize this suspect in the Seminole Heights murders contact @crimestopperstb Reward up to $91Khttps://t.co/gZ3ykC7Vif — TampaPD (@TampaPD) November 15, 2017 
  
 Police are not calling the suspect a serial killer because they can't determine whether the same person committed all the murders, Dugan said, adding that authorities are "pretty convinced" that the suspect was involved in at least Mitchell's and Felton's. 
  
 "Someone has to know who this individual is," he said, citing the suspect's "unique walk" and "unique posture." 
  
 Jones, Octavio/Tampa Bay Times via AP 
  
 The suspect is striking "under the cover of darkness" against people who are alone and "probably preoccupied," Dugan said. A motive is not yet known. 
  
 Felton was supposed to meet up with someone Tuesday when someone came from behind and shot him as he was crossing the street, Dugan said after the killing. Police responded to the scene within minutes and formed a perimeter eight blocks wide, but the suspect fled northeast from the area, Dugan said. 
  
 Courtesy James Felton 
  
 Investigators have received more than 450 tips since Felton's death on Tuesday and 2,300 tips in all, Dugan said. A reward for information leading to an arrest has increased to $91,000 he said. 
  
 "Let's hope this motivates somebody with the strength and fortitude to step forward," he said, emphasizing that investigators need names rather than profiles or speculation in order to more easily eliminate possible suspects. 
  
 The first three victims were killed within 11 days in October. After Mitchell was killed on Oct. 9, the body of 32-year-old Monica Hoffa was found on Oct. 13, just half a mile from where Mitchell was killed, police said. Anthony Naiboa, 20, a man Dugan described as having "mild autism," was killed on Oct. 19 after taking the wrong bus home from work. 
  
 If you're reading this and have info about the #SeminoleHeights murders we're pleading with you to contact @crimestopperstb pic.twitter.com/CGneg1Md2p — TampaPD (@TampaPD) October 31, 2017 
  
 Dugan said he believes the community has rallied together and "given a strong message to whoever is doing this," citing the weekslong gap between Naiboa's and Felton's deaths. Dugan encouraged Seminole Heights residents to continue to keep their porch lights on between 6 p.m. and 6 a.m. and to "stick together" when they are outside. 
  
 ABC News 
  
 Dugan has been experiencing a "tremendous amount of anxiety" since the killings began, he said. 
  
 "I don't sleep at night. How could I?" he said. ||||| Watch this video. Pay attention to the walk. Pay attention to the way he flips his phone. If you recognize this suspect in the Seminole Heights murders contact @ crimestopperstb Reward up to $91Khttps://youtu.be/qyfTvCg_M90 ||||| TAMPA — One day after another unsolved fatal shooting in Seminole Heights, Tampa Police Chief Brian Dugan said Wednesday it doesn’t matter whether the murders are the work of a serial killer or several different people. 
  
 "We have four families devastated," Dugan said at a news conference. "Beyond the families we have their friends devastated and have a police department that’s been tilted and have a community that is very intense and rightfully so. And so it really doesn’t matter at this point how we label it, whether it is one individual or two. We need this to stop." 
  
 But as he has said previously, Dugan remains convinced the unsolved homicides are all connected. 
  
 "It’s the time, the methodology, the fact that they were all alone,’’ he said. "There is no motive. Nothing is taken or anything like that." 
  
 The killings began Oct. 9 with the shooting of Benjamin Mitchell, 22. Two days later, Monica Hoffa was shot dead and her body found two days later. On Oct. 19, Anthony Naiboa, 20 was gunned down. And early Tuesday morning Ronald Felton, 60, was shot dead. 
  
 In an effort to draw out more tips, Dugan released a new video showing a person he is now identifying as a suspect in at least two of the Seminole Heights killings. 
  
 "We have very limited evidence," Dugan said. "That is why we are doing this appeal — to have someone tell us who is in that video. They could be perfectly innocent, but I don’t think so." 
  
 Dugan said the video was taken moments before Felton’s murder early Tuesday. The chief said he believes someone must recognize the person. 
  
 "I don’t need speculation. I don’t need profiles," Dugan said. "We need names. 
  
 Dugan noted the gait and manner in which the suspect walked, saying it was similar to a person captured in video Oct. 9, the day Mitchell was killed. He was described as a black male, about 6 feet to 6-foot-2 with a thin build and light complexion. 
  
 The chief seized on the casual manner in which the person in both videos appears to be walking. The Oct. 9 video showed him looking at and flipping his phone shortly before the shooting. 
  
 "It’s clear to me that this person is able to flip a switch and murder someone," Dugan said. 
  
 Meanwhile, the reward has gone up to $91,000, with the Federal Bureau of Investigation offering $50,000. 
  
 Dugan refused again to offer any specifics about the type of weapon or ammunition used in the crimes. He said police have continued to maintain a strong presence in the neighborhood. 
  
 So far, he said, they have knocked on 1,957 doors. 
  
 "We are out there for the long haul," he said. 
  
 Responding to a question about Naiboa’s family searching for their son’s killer and thinking they have found a suspect, Dugan said he feels for Casimar Naiboa. 
  
 "I won’t question a grieving father and how he goes about this,’’ the chief said. "I will question the people around him who might be misleading him. And I can assure him we are following up on every lead we have." 
  
 Dugan said the thought of another killing has him worried. 
  
 "I don’t sleep at night," he said. "How could I. That’s where we stand. I feel for this neighborhood, the people who live there and the businesses." 
  
 Contact Howard Altman at [email protected] or (813) 225-3112. Follow @haltman. |||||
Output:
"Watch this video," police in Tampa tweeted Wednesday in their latest appeal for help finding a suspected serial killer. "Pay attention to the walk. Pay attention to the way he flips his phone." Tampa Police Chief Brian Dugan says the video was taken moments before the Tuesday murder of 60-year-old Ronald Felton, who is believed to be the killer's fourth victim, the Tampa Bay Times reports. Dugan says police have limited information and they are making the appeal "to have someone tell us who is in that video. They could be perfectly innocent, but I don’t think so." He says the suspect strongly resembles a person seen on video before the Oct. 9 shooting of Benjamin Mitchell, the first of four people killed in what police believe is one person's killing spree. Dugan told reporters Wednesday that "it doesn't matter at this point" whether the killings are the work of one person or multiple people, as long as they stop. He added, however, that the killings appear to be the work of one person targeting random victims. "It's the time, the methodology, the fact that they were all alone," he said. "There is no motive. Nothing is taken or anything like that." The chief said he believes that a strong response from residents in the Seminole Heights neighborhood helped increase the time between the last two killings, but he has been experiencing a "tremendous amount of anxiety" since the murders began. "I don't sleep at night," he said, per ABC. "How could I?"