A manhunt is underway after a night of violence left at least seven police officers dead in Nigeria's oil-rich Rivers State on Friday, APA reports citing BBC.
Gunmen opened fire on a checkpoint in the southern state, then drove to two police stations, killing officers and burning patrol cars, police say.
Police killed two of the attackers but are searching for those who escaped.
It is not clear who was behind the killings, but the region has seen a surge in separatist attacks on police.
The unidentified armed men, driving a Toyota Hilux van, launched their "surprise assault" on the checkpoint at Choba Bridge at around 20:30 local time (19:30 BST) on Friday, police spokesperson Nnamdi Omoni said.