The Boston Marathon bombing suspects decided "spontaneously" to bomb Times Square as their next target, New York Police Commissioner Ray Kelly has said.
Mr Kelly said the pair had six explosive devices - a pressure cooker bomb and five pipe bombs - for possible use in an attack in New York.
Mayor Michael Bloomberg confirmed the information on the alleged Times Square plot came from an FBI interview with the surviving suspect Dzhokhar Tsarnaev.
More top news
An ancient ocean on the surface of Mars held more liquid water than the Earth's Arctic Ocean, scientists believe.
Chelsea fans are at the centre of a new racism storm after video emerged of supporters mocking the recent racist incident on a Paris Metro.
NASA's Dawn probe is preparing to make an historic rendezvous with the dwarf planet Ceres.