The gunman who killed the CEO of the largest U.S. health insurer three days ago may have quickly left New York City on a bus after escaping on a bicycle and hopping in a cab, police officials said Friday. Video of the gunman fleeing Wednesday's shooting of UnitedHealthcare CEO Brian Thompson showed him riding through Central Park and later taking a taxi to a bus terminal that offers commuter service to New Jersey and Greyhound routes to Philadelphia, Boston and Washington, D.C, Chief of Detectives Joseph Kenny told CNN. Police have video of the man entering the bus station but no video of him exiting, leading them to believe he left the city, Kenny said. “It’s a very busy bus terminal, we want to make sure we have the right bus. But we’re working through that right now, this is all new information,” he said. Investigators also believe the shooter left a backpack in Central Park and were carrying out a massive sweep to find it in a vast area with lakes and ponds, meadows, playgrounds and a densely wooded section called “The Ramble,” said police Commissioner Jessica Tisch. As dusk approached Friday, small groups of officers could be seen roaming among trees across ground covered with leaves. The reason for the killing remained unknown. New York City police say evidence firmly points to it being a targeted attack. MORE: https://www.wtsp.com/article/news/nation-world/unitedhealthcare-ceo-killed-hunt-for-gunman-third-day/507-2bc73ee4-6588-4158-a202-752000215c48