#BBCNewsbr Four people have died in a plane crash at London Southend Airport, UK police have confirmed.br br Essex Police said it believed the four people killed in a crash were foreign nationals.br br The aircraft was being operated by Dutch firm Zeusch Aviation and was due to fly to Lelystad Airport in the Netherlands.br br Witnesses described seeing a huge fireball at about 16:00 BST after the Beech B200 Super King Air crashed.br br An investigation is still ongoing into the cause of the crash. br br Subscribe here: br For more news, analysis and features visit: www.bbc.