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Nation in mourning after 'dark and excruciating night' 00:00:28, play videoNation in mourning after 'dark and excruciating night'

Recovery efforts continue as day breaks. 00:00:30, play videoRecovery efforts continue as day breaks

'We don't believe there are any survivors' 00:00:33, play video'We don't believe there are any survivors'

Traffic control radar indicates moment of crash. 00:00:24, play videoTraffic control radar indicates moment of crash

Air traffic controllers appear to try to stop collision. 00:01:02, play videoAir traffic controllers appear to try to stop collision

Witness describes seeing 'white flare' in the sky. 00:00:44, play videoWitness describes seeing 'white flare' in the sky

Emergency crews race to the crash site. 00:00:36, play videoEmergency crews race to the crash site

Search and rescue team at the scene. 00:00:26, play videoSearch and rescue team at the scene

'Rough conditions' on Potomac for search teams. 00:00:32, play video'Rough conditions' on Potomac for search teams

Friends and family in Kansas urged to stay home. 00:00:36, play videoFriends and family in Kansas urged to stay home

Search and rescue operation launched, says mayor. 00:00:27, play videoSearch and rescue operation launched, says mayor

Download the BBC News app. 00:00:05, play videoDownload the BBC News app