4 soldiers, 16 militants killed northwest Pak
A group of militants attacked Anargi check post in Mohmand Agency.
Four soldiers were killed and as many injured in the initial assault.
The troops repulsed the attack, killing 16 militants in retaliatory firing, the security official said.
Taliban fighters have launched several attacks on security forces in Mohmand Agency in the past few weeks.
The rebels have frequently targeted security forces convoys and check posts.