DAMASCUS, Syria (AP) — The number of dead from today's suicide bomb attacks in the Syrian city of Aleppo stands at 33, and could go higher.

The number comes from Syrian state TV, which says three bombers detonated cars packed with explosives in the main square of the city, bringing down buildings and trapping survivors under the rubble.

A fourth explosion struck near the edge of the Old City, a world heritage site. Rebels and government forces there have been engaged in fierce street fighting.

Syria's government blames the bombings on "terrorists," the term it uses for the rebels trying to force out President Bashar Assad.

Aleppo, Syria's largest city, has become a key battleground between regime forces and the rebels, who last week announced a new push to capture the city.