From ABC News

Nigeria’s navy killed six pirates and injured one other in its latest attack to try to stop the outlaws from expanding their territory in the Gulf of Guinea, a navy official said Wednesday.

The pirates engaged the navy in a gun battle late Sunday off the coast of Calabar in Nigerian and Cameroonian waters, said Delta state navy spokesman Lt. Delightsome Yohana. Nigeria’s navy fired back, killing the six pirates, he said. The other attacker is getting treatment for injuries while in custody, he said.

The operation is the latest in a string of victories for the Nigerian navy that has amped up its presence offshore and bolstered it with support from its air forces. In the last two weeks the navy has killed 18 pirates in battles and arrested five, Yohana said.

“We’ve been building our efforts for a long time. We are putting all our time, effort and resources to ensure the pirates are captured,” Yohana said.

Read more at abcnews.go.com