CAIRO - Lebanese soldiers in armored vehicles advanced into a border town that was attacked by Islamists in an incursion from Syria at the weekend, finding the bodies of 50 militants, a Lebanese security official said.

The army kept up an artillery bombardment of Arsal, a Sunni town by the border, Reuters witnesses said.

At least 13 Lebanese soldiers have been killed in the fighting, which erupted after the Lebanese security forces arrested a militant Islamist leader on Saturday.

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