New York News, July 29 -- A gunman who open fired within a Midtown Manhattan skyscraper, which accommodates the National Football League headquarters as well as the offices of several prominent financial institutions-including the hedge fund powerhouse Blackstone-has been "neutralised," according to the New York City Police Commissioner, Jessica S. Tisch.

Five people including a police officer and the suspected gunman were dead following a shooting in central Manhattan on Monday, US media reported.

"Five people, including a New York Police Department officer, were killed in today's shooting in Midtown Manhattan," a law enforcement source told broadcaster CNN, adding the suspected gunman died from what is believed to be a "self-inflicted...