In this undated photo provided by the family of Chris...

In this undated photo provided by the family of Chris McManus via the British Foreign Office, Chris McManus poses for a photograph at an unknown location. Credit: AP

One British and one Italian hostage held in Nigeria by kidnappers who claimed links to al-Qaida have been killed during a joint rescue operation, the U.K. prime minister said Thursday.

Chris McManus and Franco Lamolinara, who had been working on a bank construction project in the country's restive north, were captured in May. It appeared that both hostages "were murdered by their captors before they could be rescued" by Nigerian and British forces, Prime Minister David Cameron said.

The British leader said that after months of not knowing where the men were, U.K. authorities had "received credible information about their location." Believing the men's lives were in "imminent and growing danger," a rescue operation was mounted.

"The terrorists holding the two hostages made very clear threats to take their lives, including in a video that was posted on the Internet," Cameron said.

It was not immediately clear when the men were killed. Cameron said "the early indications are clear that both men were murdered by their captors, before they could be rescued."

The operation may have taken place in Sokoto, a quiet city in Nigeria's northwest. An AP reporter there said the military surrounded a house in the city and gunfire was heard for much of the afternoon. Shooting continued into Thursday night as the military fought with those in Sokoto. The reporter saw an ambulance ferrying the wounded, but could not get close enough to see who was inside. Security forces had a cordon up blocking journalists from getting within a kilometer (around a half mile) of the site.

Police and local authorities in Sokoto have said the military operation in Sokoto was a hostage rescue, but they did not say who the operation was aimed at rescuing.

McManus was working for the construction company B.Stabilini when he was kidnapped May 12 by gunmen who stormed his apartment in Birnin-Kebbi, in the northwest of the country. Lamolinara was also abducted. A German colleague managed to escape by scaling a wall, but a Nigerian engineer was shot and wounded.

In a statement, McManus' family said they were devastated by the news of his death.

"We are also aware of the many people who were working to try and have Chris returned to our family, and his girlfriend," the statement said. We would like to thank all of them for their efforts.

"We knew Chris was in an extremely dangerous situation. However, we knew that everything that could be done was being done. "

Italian Premier Mario Monti said Cameron had conveyed the news to him by telephone, saying in a statement that Nigerian and British authorities had determined the operation was the "last window of opportunity to save the hostages' lives."

The statement said the situation on the ground had accelerated recently, posing an "imminent danger to the lives of the hostages."

The Italians were only informed once the operation was under way, according to the statement.

Nigeria secret police spokeswoman Marilyn Ogar declined to immediately comment. The army and police could not be reached for comment.

A number of foreigners have been kidnapped while working in Nigeria in recent years. Many have worked in the oil industry.

Last year, the French news agency Agence France-Presse distributed a video of McManus and Lamolinara. The men appeared to be in good health despite months of captivity. The kidnappers had claimed in the video they belonged to al-Qaida, something unusual in Nigeria, despite the presence in the country of a growing Islamic insurgent group known as Boko Haram.

U.K. officials had asked journalists not to publicize the video, in which the kidnappers threatened to kill the two men if their demands weren't met.

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