PMAir traffic controller working at time of crash interviewed by NTSB investigatorsThe DCA air traffic controller who was working at the time of the collision has been interviewed, NTSB member Todd Inman said during the briefing.

Sixty-seven people died in a collision between a Bombardier CRJ700 regional jet operated by PSA Airlines and a military Black Hawk helicopter.

Sixty-seven people are believed to have died after a passenger plane hit a military helicopter in mid-air near Washington DC's Ronald Reagan airport on Wednesday evening.