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Al-Daleh province deputy governor Lahson Saleh says the attacker attempted to crash through the front gate of the provincial police station with a motorcycle.
After his explosives detonated, his remains were found at the site.
Saleh added on Tuesday that the injured were all policemen and two were in critical condition.
Suicide attacks are a hallmark of the local offshoot of al-Qaeda, who are known to lurk in the remote areas of the southern mountains.
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In the past few weeks, gunmen affiliated with al-Qaeda have attacked several security headquarters and ambushed soldiers in the south, killing at least two dozen.
