KANO  - Gunmen stormed a construction site in northern Nigeria, kidnapping seven foreign workers and killing a security guard, police said Sunday, in one of the worst attacks on expatriates in the restive region. Two Lebanese, an Italian and a Greek have been confirmed by their governments to be among those seized in the attack late Saturday on the Setraco construction site in the town of Jama'are in Bauchi State. Bauchi, among the states in northern Nigeria where extremist group Boko Haram has carried out repeated attacks, saw two separate gun raids earlier Saturday, but it was not clear if the militants were behind the violence. "From the report we have received, the hostages are seven in all. They include four Lebanese, an Italian, a Briton and a Greek," Bauchi state police spokesman Hassan Auyo said. There has been no confirmation that a Briton was among those kidnapped nor that the number of Lebanese was four. "We are aware of reports and are making enquiries with the local authorities," Britain's Foreign Office said. The Lebanese foreign ministry said two of its citizens were among those seized. Greek Foreign Minister Dimitris Avramopoulos said in a statement that he had contacted his Italian counterpart regarding a response, adding that a plane was on standby should it be necessary to send a party from Athens to Nigeria. Local government chairman Adamu Aliyu told AFP that residents believed a Lebanese mother and daughter were in the group taken by the gunmen, but those details could not be verified by police.