The Latest on developments in Syria, where a cease-fire is faltering further after airstrikes hit an aid convoy overnight (all times local):

12:05 p.m.

The U.N. humanitarian aid agency says it has temporarily suspended all convoys in Syria following a deadly airstrike on aid trucks the previous night.

Spokesman Jens Laerke of OCHA says the temporary suspension of the aid deliveries would hold pending a review of the security situation in Syria.

Laerke said Monday that the U.N. aid coordinator had received needed authorizations from the Syrian government in recent days to allow for aid convoys to proceed within Syria.

He said it's "a very, very dark day ... for humanitarians across the world."

The attack late on Monday came just hours after the Syrian military declared the week-long U.S.-Russian brokered cease-fire had failed. The United States said it was prepared to extend the truce deal and Russia — after blaming rebels for the violations — suggested it could still be salvaged.

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9 a.m.

Syria's cease-fire has faltered further after an aid convoy was hit by airstrikes, with activists saying at least 12 people were killed in the attack, mostly truck drivers and Red Crescent workers.

It was not clear who was behind the attack, which sent a red fireball into the sky in the dead of night over a rural area in Aleppo province. Both Syrian and Russian aircraft operate over Syria, as well as the U.S.-led coalition that is targeting the Islamic State group.

U.N. officials said the U.N. and Red Crescent convoy was delivering assistance for 78,000 people in the town of Uram al-Kubra, west of the northern city of Aleppo.

Initial estimates indicate that about 18 of the 31 trucks in the convoy were hit, as well as the Red Crescent warehouse in the area.

The Britain-based Syrian Observatory for Human Rights, an activist group that tracks the civil war, said at least 12 were killed in the attack, mostly truck drivers and Red Crescent workers.