BEIRUT (AP) — Men pull a girl from the rubble and haul her onto a dirty sheet of plastic, while another child, coated in white dust save for a red streak of blood from his nose, lies with his crushed leg dangling off a gurney — the grisly aftermath from the dropping of a crude “barrel bomb” by Syrian forces on the city of Aleppo.

The bombing — one of at least seven such attacks in Aleppo on Tuesday — struck a mosque that was being used as a school, killing at least 11 people, activists said. A video supplied by activists contained scenes of the carnage.