Six killed as jet strikes house in Washington USA.

Six people, including two children, have been killed after a private jet crashed into a house in Maryland.

The tragedy on Monday killed all three people on board the aircraft, as well as a mother and her two sons inside the property in Gaithersburg, a suburb of Washington DC.

Authorities said the plane crashed around 10.45am local time on Monday.

Witnesses told local media that the plane had been circling with the wheels down, and looked as if it was struggling for control.

They reported seeing and hearing a secondary explosion after the plane hit the ground.