BEIRUT (AP) " Gunmen early Saturday stormed an office of a Syrian paramedic group that is active in opposition-controlled areas, killing seven of its members and stealing two vehicles and other equipment in a northwestern region, the group and opposition activists said.

The Syrian Civil Defense group, more popularly known as the White Helmets, said in a statement that the attack happened in the early hours in the town of Sarmin.

No one immediately claimed responsibility for the rare attack but it came amid tension in the area. Sarmin is in Idlib province, which witnessed clashes recently between al-Qaida-linked fighters and members of the ultraconservative Ahrar al-Sham group that ended with al-Qaida fighters capturing much of the region.

The al-Qaida-linked Hay'at Tahrir al Sham " Arabic for Levant Liberation Committee " that is also known as HTS said over the past weeks that its members have discovered sleepers cells of the Islamic State group who were planning attack. Al-Qaida's affiliate that used by to be known as Nusra Front had fought deadly battles with IS over the past years.

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The Britain-based Syrian Observatory for Human Rights said the seven were killed after being shot in the head, adding that the killings were discovered when volunteers from Syrian Civil Defense arrived to start a shift and found the bodies of their colleagues.

"Until now it is mostly likely a crime. It might also be an attack aimed to harm the image of Nusra Front and to show that Idlib is not safe," said Rami Abdurrahman who heads the Observatory.

An opposition activist based in Idlib who has been giving information to The Associated Press about the province for years said the attackers used pistols equipped with silencers, adding that people living nearby did not notice anything unusual.

The activist, who asked that his name not be used for fear of reprisals, said IS sleepers have been discovered in Sarmin. He added that most likely members of IS carried out the attack to show that Idlib is not safe.

The activist said the HTS-linked Judicial Committee is investigating the case.

Sarmin used to be a stronghold of Jund al-Aqsa extremist group that clashed with al-Qaida last year before many of its members were allowed to head to areas controlled by IS whom they are fighting along now.

The Syrian first-responders have been known to risk their lives to save people from the civil war, now in its sixth year. The White Helmets group was also nominated for last year's Nobel Peace Prize.