There's a long and detailed statement from Rwandair here -
One Passenger Dead Statement from Rwandair regarding aircraft crashing into Kigali International Airport building - eTurboNews.com
Snippet:
At 1240 hours, flight number WB205 took off for Entebbe with 9 adults and an infant. A crew of three – captain, first officer, and an engineer manning the flight and two RwandAir flight attendants were on board the flight. Two minutes into the flight, the captain called the control tower asking to land back because of a technical problem with the engine’s thrust lever (throttle). The aircraft safely landed and taxied into the parking bay. However, as the ground crew went to put on the back wheel chocks, the aircraft suddenly accelerated, turned right and hit the eastern wall of the VIP building after covering a distance of about 500 meters. After hitting the wall, the flight attendants aboard the aircraft initiated an evacuation sequence, and the passengers escaped through the over-wing emergency door and walked away from the aircraft to the terminal building.