At least 42 people were killed and dozens more wounded on Thursday in air strikes on a village mosque in northern Syria, the Syrian Observatory for Human Rights said.
"The raids by unidentified warplanes targeted a mosque in Aleppo province during evening prayers, killing 42 people, most of them civilians," said the head of the Britain-based Observatory Rami Abdel Rahman.
"More than 100 people were wounded," he said, adding that many were still trapped under the collapsed mosque in the village of Al-Jineh, just over 30 kilometres (20 miles) west of Aleppo.
The village is held by rebel and Islamist groups, but no jihadist factions are present.
Rescue workers struggled to pull survivors from rubble, and dozens of residents were still unaccounted for, the Observatory said.
The Observatory, which relies on a network of sources inside Syria for its information, says it determines whose planes carry out raids according to type, location, flight patterns and munitions used. But the skies over Aleppo province are busy, with Syrian regime and Russian warplanes as well as US-led coalition aircraft carrying out air strikes