The US has denied Russian claims it masterminded an alleged drone attack on the Kremlin on Wednesday aimed at assassinating President Vladimir Putin. A day after accusing Ukraine of carrying out the alleged attack, Mr Putin's spokesman said it had been done with Washington's support. US National Security spokesman John Kirby called it a "ludicrous claim". Ukraine has said it had nothing to do with the alleged attack. Unverified footage on social media showed smoke rising over the Kremlin - a large government complex in central Moscow - early on Wednesday. A second video showed a small explosion above the site's Senate building. Mr Putin was not in the building at the time. Please subscribe here: http://bit.ly/1rbfUog #Ukraine #Russia #America #BBCNews