Gunmen killed a policeman and six employees of Nigerian oil and gas services company Lee Engineering during an attack on a project site in Imo, police said on Tuesday.
The attack took place in the Assa community in Ohaji/Egbema Local Government Area of Imo State.
An unspecified number of persons, reportedly sustained gunshot wounds.
“We have declared the place a black spot and all efforts to arrest perpetrators are ongoing,” said Imo State police spokesman Michael Abattam.
“The command has put in measures to guard the workers in the area since it is prone to attack,” he said.