Investigators will be back at the scene of Masterton's mid-air collision today

Two pilots were killed above Hood Aerodrome on Sunday morning.

The Civil Aviation Authority and Transport Accident Investigation Commission have been examining the scene.

A team of three investigators from the commission will be on site today.

Evidence being collected includes recording the accident scene, recovering wreckage, interviewing witnesses and gathering documents related to the two aircraft.

After the examination's finished, the wreckage will be shifted to a technical facility in Wellington.