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KABUL, Afghanistan (AP) _ Afghan security forces detained 400 people in southwestern Afghanistan after unidentified attackers shot and wounded a provincial intelligence chief, officials said Friday.

The attackers hid in a field in Helmand province and ambushed local intelligence chief Dahd Mohammed Khan as he was driving by on Wednesday, slightly wounding him and a colleague, said Gov. Sher Mohammed Akhund.

In retaliation the authorities launched a massive sweep, surrounding Sangine district and rounding up 400 men. They seized 60 Kalashnikov assault rifles and ammunition, Mohammed said.

It was unclear why so many men were detained or how many were actually involved in the ambush.