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BEIRUT (Reuters) - Air strikes hit Syrian Red Crescent offices in the northwestern city of Idlib after midnight on Wednesday, injuring several staff and causing extensive damage, the Syrian Observatory for Human Rights reported.

It was not clear which air force the jets belonged to or whether they had taken off from inside Syria or crossed its borders, the British-based Observatory said.

Russian and Syrian warplanes have been carrying out raids against Syrian insurgents in Idlib province, a rebel stronghold, but since the new year U.S. air strikes have also targeted militants in Idlib formerly affiliated to al Qaeda.

Among those wounded in Wednesday’s raid was the director of the local Red Crescent branch, the Observatory said.