The Latest developments in the Syrian civil war (all times local):

3:45 p.m.

Syria activists say at least 15 civilians have been killed when suspected government helicopters dropped barrel bombs on a wake for children killed in earlier airstrikes in rebel-held Aleppo.

Hospital officials in rebel-held Aleppo say the death toll from the two barrel bombs dropped Saturday in the Bab al-Nairab neighborhood is likely to rise. Mohammed Khandakani, a hospital volunteer, said one of the injured told him a barrel bomb was dropped as people paid their condolences for children killed Thursday in an airstrike that left 11 children dead in the same neighborhood. Minutes later, Khandakani said another barrel bomb was dropped, injuring an ambulance driver, and hampering rescue efforts.

The Syrian government and its Russian ally are the only ones operating helicopters over Aleppo. The government denies it uses barrel bombs.

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1:15 p.m.

Kurdish-led forces in northern Syria say Turkish airstrikes have hit their bases near Jarablus, a town seized by Turkey-backed rebels earlier this week.

The Jarablus Military Council says the airstrikes Saturday on their bases in Amarneh village marked an "unprecedented and dangerous escalation" and came after Turkish artillery shelled the positions the day before.

The Britain-based Syrian Observatory for Human Rights confirmed the airstrikes. Turkish officials could not immediately be reached for comment.

The Jarablus Military Council is supported by the U.S.-backed and Kurdish-led Syria Democratic Forces. Turkey sent tanks across the border to help Syrian rebels capture Jarablus from the Islamic State group.

The incursion was partly aimed at containing Kurdish-led forces. Turkey says the Kurds must withdraw to the east of the nearby Euphrates River.