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The group, in a statement circulated by supporters on social media, said one of its members, named as Abu Abdullah al-Tunisi, blew himself up with a suicide belt on the bus carrying the troops.
The claim, which could not immediately be verified, is in line with similar claims of responsibility made by the group in the past.
It is accompanied by a picture of the supposed attacker wearing what appears to be a suicide vest and with his face masked.
