A small plane crashed at London Southend Airport in Sussex, England, on Sunday, killing all four people on board, according to local officials.

A witness who was at the airport with his family said he saw a “big fireball” after the plane “crashed head first into the ground.”

Investigators probing the Southend Airport plane crash have spoken out as new details about the horror incident have emerged. It has now been confirmed that four foreign nationals died on board a plane that crashed after taking off from London Southend Airport on Sunday (July 13).