PUPILS have launched an investigation after a UFO was discovered in the school field.

The mysterious silver rocket appeared in the grounds of St Wilfrid’s RC Primary School, in Bishop Auckland, in the early hours of Monday morning.

Headteacher Simon Rudd called the “police” to cordon off the scene and since about 250 pupils have been trying to piece together what has happened.

So far examinations have uncovered the sighting of at least four different colour aliens running from the scene, green slime at the front of the UFO, a fire in the engine and skid marks and broken tree branches nearby.

The youngsters are keeping log books detailing the events, as part of their writing project and are hoping to have solved the mystery by the end of the week.