A suicide bomber driving a truck packed with 1.5 metric tons of explosives killed at least 31 people and wounded dozens in the Syrian city of Hama on Sunday, state media and a monitoring group reported.
The man blew himself up inside the vehicle on a busy road on the outskirts of the city in central Syria, the SANA news agency said.
The pro-opposition Syrian Observatory for Human Rights said the attack targeted an army checkpoint but most of the dead were civilians.
According to the Observatory, the suicide bomber was from the Nusra Front, an al Qaeda affiliate that has frequently used suicide bombers to attack military and political targets.
Pictures on Syria TV showed firemen trying to put out huge fires as black smoke rose from charred trucks and cars, Reuters reported.
Rebels also used a car bomb a day earlier to attack a checkpoint on the outskirts of Damascus. Heavy clashes erupted after the blast and continued on Sunday.
Rebels said they seized the first checkpoint and were now fighting to capture a second one down the road. The checkpoints, to the southeast of the capital, sit between the rebel-held suburb of Mleiha and the government-held suburb of Jaramana.
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