Video: Letupan Terowong Membunuh 40 Askar Basyar

Syrian rebels blew up a tunnel packed with explosives in the northern city of Aleppo on Friday, killing at least 20 pro-government fighters, activists and rebels said.

A rebel alliance called the Islamic Front claimed responsibility for the blast.

They uploaded a video of the explosion to YouTube, saying that it killed at least 40 government soldiers.

the Islamic Front has frequently used tunnels to plant massive amounts of explosives beneath army positions.