At least 30 rebels were killed and tens of others wounded on Sunday, when a blast rocked a rebel-held border crossing between Syria and Turkey.
The Syrian Observatory for Human Rights says that a suicide bomber detonated an explosive vest on a bus in Syria near the Atmeh border crossing into Turkey and dozens were injured, some critically.
The bus was carrying fighters for Syria's civil war.
Syria's Idlib province, where Atmeh is located, is a major bastion of the Turkey-backed opposition to President Bashar al-Assad's rule.
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