A warplane on Saturday attacked a makeshift hospital set up in a cave in the northern Syrian province of Idlib, causing massive damage and wounding several staff, a monitor said.
The head of the Britain-based Syrian Observatory for Human Rights said it was not immediately clear if the strike was carried out by a Syrian or Russian aircraft.
Rami Abdel Rahman said the attack hit "a hospital located in a cave in the Abdeen region in southern Idlib province, causing huge damage and knocking it out of action".
"Five staff members were wounded and were pulled from the rubble, but four more are still trapped beneath it," Abdel Rahman said.
Idlib is controlled by a rebel alliance that includes a former Al-Qaeda affiliate, and is regularly targeted by both the Syrian government and its Russian ally.
Earlier this month, a suspected chemical attack hit the town of Khan Sheikhun in Idlib, killing dozens of civilians including children.
Much of the international community blamed the Syrian regime for that attack, and three days later 59 cruise missiles fired from US warships targeted the airbase from where the attack was launched.
Abdeen, where the hospital was hit on Saturday, is eight kilometres (five miles) from Khan Sheikhun.
The Observatory said regime forces fired a rocket at the Abdeen region after the air strike, killing a young man working in a field.
More than 320,000 people have been killed in Syria since the conflict began in March 2011 with anti-government demonstrations.
UN, Russia set for Syria meet without US
The UN's Syria envoy said Thursday that he will hold talks with Russian officials next week but without the US present after previous plans for a trilateral meeting were "postponed".
UN peace mediator Staffan de Mistura said his meeting with Russia's deputy foreign minister Gennady Gatilov is set for Monday in Geneva.
"The trilateral meeting is not off the table, it is simply being pos … read more
