Officials in Syria say at least 33 people were killed and dozens were wounded by five bombs in the centre of the city of Aleppo on Wednesday.
Four of the explosions were in the main square near a club for military officers and a hotel.
The BBC reports that entire buildings have been levelled. Some of the blasts were carried out by suicide car bombers.
Bombings have become increasingly common in the conflict, which began in March last year.
On 18 July, rebels bombed a complex in the capital Damascus, killing four senior security officials.
The military staff headquarters in Damascus was bombed last week.
Government forces have been fighting rebels for weeks for control of Aleppo, the second largest city in the country.