At least seven persons, including three naxals, were killed following an attack by Maoists at a government camp in Bijapur district of Chhattisgarh Monday, police said.

"A total of seven bodies have so far been recovered, including that of four villagers, staying in Gangalur camp," Bijapur police told PTI.

More than 300 armed naxalites attacked the camp, where about 5,000 people had taken shelter because of naxal violence, and killed four villagers, besides attacking a nearby police station, they said.

The ultras raided the camp for over an hour, in which four villagers were killed.

On hearing gunshots, security personnel rushed from the police station, but came under attack from the ultras, which was retaliated.

However, no security personnel was injured, they said. But in the counter offensive, at least three armed naxalites, including one woman, were killed, they said.

"Combing operation in the area is continuing and we are sure that more naxalites have been killed, whose bodies have been taken away by the Maoists with them," police said adding, investigation was on to ascertain if the ultras have kidnapped tribals from the shelter home.