New York's world famous Times Square was shut down early this morning after an explosion rocked a military recruitment office. Police closed off the busy area after the 'pipe bomb' blast shook the office at 3.45am. It has been reported that a second unexploded device was also discovered. No one was injured in the blast, which reportedly was caused by a canister packed with gunpowder, but the recruitment centre's window and door was damaged. Police say they are searching for a man on a bike who was seen in the area at the time of the blast. Armed NYPD officers immediately swarmed onto the streets of Midtown Manhattan and bomb-sniffing dogs to contain the area. Times Square has now been fully reopened. Stock Picture by Splash News / Phil Penman