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.”

Four people were killed when a small plane crashed at a London regional airport at the weekend, UK police have said. The plane went down around 4pm on Sunday (local time), shortly after departing London Southend airport in southeast England for the Netherlands.