A midair collision between an Army helicopter and a jetliner killed all 67 people aboard the two aircraft, officials said, as they scrutinized the actions of the military pilot in the country’s deadliest aviation disaster in almost a quarter century.

Divers are expected to return to the Potomac River as part of the recovery and investigation after the United States’ deadliest aviation disaster in almost a quarter century.

At least 28 bodies were pulled from the icy waters of the Potomac River after the helicopter apparently flew into the path of the American Airlines regional jet late Wednesday while it was landing at Ronald Reagan National Airport,