UNITED NEWS INTERNATIONAL (UNI) — A passenger plane crashed outside the capital of Russia killing all 71 people on board.

The An-148 twin-engine regional jet went down shortly after leaving Moscow’s Domodedovo airport Sunday afternoon, Feb. 11. It had been traveling to the city of Orsk in the Ural mountains.

CNN reported emergency workers found around 200 body parts and debris strewn over a snowy field.

The search for victims’ remains is expected to take a week. The Russian Emergencies Ministry listed passengers as being between the ages of 5 and 79.

By Monday, officials had recovered both parts of the plane’s black box, including its cockpit voice recorder and flight data recorder.

Authorities had not said what caused the crash at the time of this post, though pilot error, weather or a technical malfunction are a few possibilities currently under investigation.

RT News said eyewitnesses reported seeing a flash in the sky which may suggest an engine malfunction.