At least six construction workers, some of them foreigners, have been seized by gunmen who attacked a camp in northern Nigeria, officials say.
One of the workers seized was Italian and at least one other was said to be Lebanese.
But UK officials could not confirm a report that another was British.
No-one has admitted the abductions but the Islamist militant group, Boko Haram, has staged a series of attacks in northern Nigeria.
A security guard was reportedly killed as the attackers targeted the workers' camp at Jamaare in Bauchi state.
According to an Associated Press report, as many as seven foreign workers were seized.
One local official told AP the workers were from the UK, Italy, Greece and Lebanon.
An Italian foreign ministry spokesman told Reuters news agency that an Italian man was among the workers who had been taken from the site, run by Lebanese-owned firm Setraco.
A UK foreign office spokesman said it was investigating reports of a Briton being kidnapped.
Bauchi police commissioner Mohammed Ladan told AFP that the attackers had initially targeted a prison and police station in the rural town of Jamaare, some 125 miles (200km) north of the state capital, Bauchi.
They then moved on to a camp belonging to Setraco, killing a guard and seizing the workers. Setraco is currently expanding a major road in the area.
The state capital has itself been attacked several times by Boko Haram, which wants to impose Sharia across Nigeria.