Attack on Syrian medical facility kills 4 staff

FILE - This Tuesday, Sept. 20, 2016, image provided by the Syrian anti-government group Aleppo 24 news, shows a vest of the Syrian Arab Red Crescent hanging on a damaged vehicle, in Aleppo, Syria. A U.N. humanitarian aid convoy in Syria was hit by airstrikes Monday as the Syrian military declared that a U.S.-Russian brokered cease-fire had failed, and U.N. officials reported many dead and seriously wounded. (Aleppo 24 news via AP) (The Associated Press)

FILE - This Tuesday, Sept. 20, 2016, file image provided by the Syrian anti-government group Aleppo 24 news, shows damaged trucks carrying aid, in Aleppo, Syria. A U.N. humanitarian aid convoy in Syria was hit by airstrikes Monday as the Syrian military declared that a U.S.-Russian brokered cease-fire had failed, and U.N. officials reported many dead and seriously wounded. (Aleppo 24 news via AP) (The Associated Press)

In this photo provided by the Syrian Civil Defense White Helmets, men stand amid rubble after airstrikes in al-Mashhad neighborhood in the rebel-held part of eastern Aleppo, Syria, Wednesday Sept. 21, 2016. Ibrahim Alhaj, a member of the volunteer first responders known as the Syria Civil Defense, said 24 people were killed in a series of bombings in several parts of the besieged city Aleppo on Wednesday. (Syrian Civil Defense White Helmets via AP) (The Associated Press)

A medical relief organization says four of its staff have been killed in an attack on a medical facility in Syria.

The International Union of Medical Care and Relief Organizations says an airstrike Tuesday night in northern Syria leveled a medical triage point in rebel-held territory outside the contested city of Aleppo.

The Britain-based Syrian Observatory for Human Rights monitoring group puts the toll at 13 dead, among them four nurses and paramedics and nine rebel fighters, some of them belonging to the al-Qaida-linked Fatah al-Sham Front.

It says the triage point was located in the rebel-held town of Khan Touman, south of Aleppo.

There were no reports on who was behind the strike.