The militant group said it killed the hostages.
New Islamic extremist group, Ansaru, said on Saturday that it has killed seven foreign construction workers abducted in Bauchi State a fortnight ago, according to an online message purportedly from the group.
The message said the workers were killed because of attempts by Nigeria and Britain to free them.
The statement, published on an Islamist website, contains shots purporting to show the killing.
The statement could not be independently verified, and the federal government did not confirm or deny its authenticity.
The message said Ansaru fighters killed the hostages after British warplanes were reported to have been sighted in Bauchi.
“(We) announced the capture of seven Christian foreigners and warned that should there be any attempt by force to rescue them will render their lives in danger,” the statement said.
“The Nigeria and British government operation led to the death of all the seven Christian foreigners. As a result of this operation, the seven hostages were killed,” the group said in the statement. It said a video of the killings would be posted online.
Gunmen killed a security guard on February 16 before abducting the men in Setraco compound in Jama’are, Bauchi. Ansaru later claimed they carried out the attack because of France’s military intervention in Mali.
Those kidnapped include citizens of Britain, Greece, Lebanon and Italy.