ISIS has reportedly launched an offensive in Syria, targeting the Syrian government’s only supply line to the Aleppo Governorate.

A military source was quoted by Al-Masdar News as saying that the terrorist group began the assault on Tuesday night along the Ithriya Road near the Hama-Aleppo axis.

The attack aimed at using the cover of night in order to catch the Syrian Arab Army’s position to catch the army forces off-guard.

The source said that despite the intensity of the terrorist group’s attack in northeast Hama, most of the infiltration attempts by ISIS have been foiled.

Clashes are still ongoing between the Syrian army and ISIS. However, the Ithriya Road has been declared safe and will be reopened shortly after ISIS militants retreat from the area.

Also on Tuesday, the Syrian Observatory for Human Rights, a group mostly advocating anti-government forces in the war in Syria, said that the U.S.-led military campaign killed a total of 225 civilians between April 23 and May 23.

This is the highest 30-day toll since the campaign was launched back in 2014.

“There has been a very big escalation ... The past month of operations is the highest civilian toll since the coalition began bombing Syria,” Rami Abdel Rahman, the Observatory chief said.