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

Four people who died when a small plane crashed at London Southend Airport are believed to be foreign nationals, police have confirmed. The airport has been closed since emergency services were called to the incident involving a Beech B200 Super King shortly before 16:00 BST on Sunday.

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.”