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Report: Engines failed on helicopter that hit pub

FILE- Scottish Fire and Rescue services look on as a police helicopter is lifted from the roof of The Clutha pub in Glasgow, Scotland, in this file photo dated Monday, Dec. 2, 2013. The helicopter crashed into the crowded Glasgow pub killing three helicopter crew members and seven people on the ground. According to an interim report released Friday Feb. 14, 2014, investigators say the police helicopter crashed with such force that the pub roof collapsed after it suffered double engine failure, but no emergency signal was sent and the reason for the crash remains unclear. (AP Photo/FILE)

LONDON (AP) -- A police helicopter that crashed onto a pub in Glasgow, killing 10 people, suffered double engine failure for reasons that remain unclear, investigators said Friday.

The Air Accidents Investigation Branch said in an interim report that the right engine on the Eurocopter EC135 Type 2 helicopter "flamed out and shortly after the left engine flamed out" as it flew over the Scottish city on Nov. 29.

It said further investigation would try to determine why both engines failed when the helicopter had 168 pounds (76 kilograms) of fuel in its tanks.

It will also seek to understand why the helicopter failed to send an emergency signal and why it was unable to make a controlled descent when its engines failed.

Investigators said the aircraft's rotors were not turning when it slammed into the Clutha Vaults pub with such force that the roof collapsed. Three crew members and seven people on the ground were killed.