article_snippet.sent: Scroll down for video .
article_snippet.sent: Lauren Cope, a reporter for the Eastern Daily Press who was at the press launch, said: 'It's very quiet here and everyone is very emotional.'
article_snippet.sent: We didn't know anybody had died until now.
article_snippet.sent: It is a terrible tragedy and very unusual because the teams involved are highly skilled.
article_snippet.sent: A local resident says A local resident knew something bad had happened when A local resident heard police sirens rushing to Panshangar airfield near Welwyn Garden City .
article_snippet.sent: says she heard the emergency services rushing to the scene.
article_snippet.sent: she said: 'I assumed it was a crash on the main road.
article_snippet.sent: I knew something big had happened