New York explosion leaves dozens injured An explosion ripped through the Chelsea neighborhood in New York City Saturday night injuring dozens and a second device with wiring was found blocks away, authorities say. Police officers and federal agents were scouring the streets with flashlights, robots and dogs to ensure there were no other devices in the area. New York City Mayor Bill de Blasio told reporters early indications are that the explosion at 23rd Street and 6th Avenue in Manhattan that injured 29 “was an intentional act.” Investigators believe the blast was caused by an explosive device in or near a dumpster, a law enforcement source told CNN. Police have video from businesses on the street where the explosion occurred, which could yield key details about the hours before the attack. Investigators are looking at surveillance video appearing to show a person near where the explosion at the 23rd street location occurred, according to a local and federal law enforcement official. Investigators are trying to determine if that individual is connected to the explosion. De Blasio says “there is no evidence at this point of a terror connection” and there is no “credible and specific threat” to New York City. Police have increased security across the five boroughs as a precaution, a law enforcement source told CNN. Ambulances arriving at some local hospitals were being checked by armed guards. 24 people were taken to the hospital after the explosion, but “none of those injured are likely to die,” the mayor says. De Blasio says they also believe there is no specific connection to an earlier incident in New Jersey, where an explosion went off in a garbage can on the route of a Marine Corps charity run. A second device blocks away As first responders converged on the explosion site and began blocking off streets in the Chelsea neighborhood, attention soon turned to a second device. Blocks away from the first explosion, what appears to be a pressure cooker with dark colored wiring coming out of the top center of the device was found, according to multiple local and federal law enforcement officials. The device is connected by silver duct tape to a small dark colored device attached to the outside of the pressure cooker, according to multiple local and federal law enforcement officials. None of the officials would say at this point what was inside the pressure cooker. Some residents in the area say they were told to stay away from windows when police were searching the area. Police combed the second location with flashlights, looking under cars, looking in trash cans and looking in doorways. How it all unfolded Surveillance video from the explosion in Chelsea shows windows shattered with terrified people running on the streets and ducking. The video, which shows angles from inside and outside Orangetheory Fitness in Chelsea, shows a screen laying outside on the street after the explosion and what appears to be papers flying in the air. Danilo Gabrielli, a 50-year-old Chelsea resident, was at his 23rd street apartment about a block away from the explosion site(CNN).