Four dead in second Pakistan Air Force crash in a week
Two Pakistan Air Force light aircraft have collided in mid-air on a routine training mission north-west of Islamabad - killing two trainee pilots and two instructors - police say.
Correspondents say it was the second Pakistan Air Force crash in a week and the sixth in seven months.
The crashes have raised concerns about the safety of its predominantly Chinese and locally-made fleet.
The cause of the latest accident was not immediately clear.
One of the two-seater propelled Mushshak planes crashed into a house, injuring a girl and an elderly man, while the second came down in fields in the Rashkai area, 160km (100 miles) north-west of the capital.
On Friday a fighter jet crashed near the south-western town of Sonmiani but the pilot managed to eject safely.