At least 14 people have been killed in a bomb attack on a police truck in northwestern Syria near the Turkish border, state media and opposition activists said.
The official Sana news agency blamed the ambush, in which 26 others were wounded, on "terrorists".
The violence broke out on the Idlib-Ariha highway in Jisr al-Shughour, an area that has seen fierce fighting between Syrian soldiers and army defectors.
Four bombs that exploded in "two phases" hit the truck, which was transporting prisoners. The attackers then targeted an ambulance that arrived to assist the wounded, according to Sana reports.
Six policemen accompanying the prisoners were wounded, some of them in critical condition, it said.
The Syrian Observatory for Human Rights, a UK-based opposition activist group, confirmed the attack but put the death toll at 15 prisoners. Director Rami Abdul-Rahman said the truck was hit by several roadside bombs, but it was not clear who was behind the violence.
There was no immediate claim of responsibility, but members of the so-called Free Syrian Army are known to be active in the area.
Dozens of people have also been reported wounded in heavy clashes between Syrian troops and defectors in the Jabal al-Zawiya region, along the Turkish border.
The clashes come a day before Arab League monitors are due to decide whether to extend their mission for another month. The UN estimates about 5,400 have been killed in the 10-month uprising against President Bashar Assad.