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In Turkey, Interior Minister Muammer Guler said the death toll from an attack Monday on a border crossing between Syria and Turkey had risen to 14 from 13.

The frontier area has seen heavy fighting, although attacks on the crossings that are used by Syrian refugees and international aid agencies have been rare.

A major Syrian opposition faction accused the government of the bombing, saying it narrowly missed 13 leaders of the group, including its president.

Syrian National Council President George Sabra told reporters in Turkey on Tuesday that the car bomb went off shortly before the SNC president and 12 other members of the group’s executive council drove through a border crossing with Turkey.

“We heard an explosion nearly half an hour before we reached the border crossing point,” Mr. Sabra said.

There was no claim of responsibility for the blast. Turkish Deputy Prime Minister Besir Atalay said Tuesday that a preliminary investigation indicated that three assailants parked a car packed with explosives in no man’s land between two border gates, then detonated it remotely about 20 minutes later.

• Associated Press writer Suzan Fraser in Ankara, Turkey, contributed to this article.