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A British military helicopter crashed Sunday in the Afghan capital of Kabul, killing five people and injuring five others, the NATO-led alliance in the country said.

Two British Royal Air Force members were among the dead in the crash of three Puma Mk 2 helicopters Britain has deployed in the NATO mission, the British Defense Ministry told NBC News.

Related: Suicide Bomber Hits Coalition Convoy in Kabul

The helicopter, part of Operation Resolute Support, crashed in what the ministry and NATO called an accident at the mission's Kabul headquarters about 4:15 p.m. local time (7:45 a.m. ET).

NATO soldiers arrive at the scene of a suicide car bomb attack Sunday in Kabul, Afghanistan. Noorullah Shirzada / AFP — Getty Images

No other details were made available, including the nationalities of the others involved or the precise circumstances of the crash, which crash came the same day a suicide car bomb struck a convoy of coalition forces in Kabul. The number and nature of the casualties remained unknown late Sunday.

About 12,500 NATO personnel are in Afghanistan as part of the mission to support and train Afghan security forces.