Federal aviation regulators issued an emergency order Monday grounding the helicopter tour company involved in a deadly New York crash after learning it had fired its operations director minutes after he had agreed to suspend flights during the investigation.

Meanwhile, divers from the New York Police Department continued recovery operations on April 13, searching for several parts of the helicopter.

New York Helicopter Tours announced it is shutting down operations immediately after six people were killed when a chopper crashed in the Hudson River on Thursday afternoon.