Nigerian authorities blamed the violence on a local separatist group. Two local US embassy staffers and two policemen were killed, while three were abducted.
EDnews informs via DW that a US convoy vehicle with embassy staffers was attacked in Anambra state, in southeast Nigeria, on Tuesday.
Two local workers and two policemen were killed while the assailants abducted three others, authorities said.
During a briefing with reporters in Washington, US National Security Council spokesman John Kirby said that "no US citizens were involved."
Authorities blamed the violence on a separatist group called the Indigenous People of Biafra (IPOB).