Gunmen took the workers from the offices of Setraco, a construction company in Jama'are, in Bauchi State, police said.

CNN: STORY HIGHLIGHTS

Italian, British, Greek and Lebanese workers are thought to be among those held after an attack on a construction project in Bauchi state.

BBC: France asks nationals to leave north Cameroon

Greece also confirmed one of its citizens had been killed by Ansaru, the radical group that claimed responsibility for abducting the foreigners from northern Bauchi state in Feb. 16.

NPR: Italy Says 7 Foreign Hostages Killed In Nigeria

Ansaru previously issued a short statement saying its fighters kidnapped the foreigners Feb. 16 from a construction company's camp at Jama'are, a town about 200 kilometers (125 miles) north of Bauchi, the capital of Bauchi state.

NPR: Italy Says 7 Foreign Hostages Killed In Nigeria

The hostages were captured in a raid on a construction site in the northern state of Bauchi.

BBC: UK

An Italian, a Greek and four Lebanese workers were also seized in the raid on the Setraco construction site, in the northern state of Bauchi.

BBC: Brendan Vaughan

Earlier this month, another militant Islamist organisation, Ansaru, claimed to have killed seven foreign hostages seized in the northern Nigerian state of Bauchi in February.

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In an online statement Saturday claiming the killings, Ansaru said it killed the hostages in part due to local Nigerian journalists reporting on the arrival of British military aircraft to Bauchi, the northern state where the abductions occurred.

NPR: Italy Says 7 Foreign Hostages Killed In Nigeria

The raid was preceded by an attack on the local police station, when two vehicles were blown up, in the town of Jama'are, some 125 miles (200km) north of the state capital, Bauchi.

BBC: Nigeria foreign workers abducted in Bauchi state - police