A port official has admitted that a 'weapon of mass effect' has been found by 'partner agencies' in the U.S., raising major questions over a possible government cover-up.

The disturbing revelation came in an interview with San Diego's assistant port director screened by a television channel in the city.

The Customs and Border Protection Department tried to dampen speculation over his remarks, but doubts remained over whether he had inadvertently revealed a dirty bomb plot to attack the U.S. mainland.

Think-tank says new building early in its construction

Pakistan "determined" to make more weapons-grade plutonium

Vienna - Pakistan appears to be building a fourth military nuclear reactor, signalling its determination to produce more plutonium for atomic weapons, a U.S.-based think-tank said.

The report came as India and Pakistan agreed to resume peace talks that were broken off by New Delhi after the 2008 Mumbai attacks, a move that should help ease tensions in the volatile region.

The nuclear-armed neighbours have been under pressure from the United States to reduce tension because their rivalry spills over into Afghanistan, complicating peace efforts there.

The Institute for Science and International Security (ISIS), a think-tank specialising in nuclear proliferation issues, said it had obtained commercial satellite images from mid-January.

They showed "what appears to be a fourth reactor under construction at Pakistan's Khushab nuclear site," ISIS experts David Albright and Paul Brannan said in the Feb. 9 report.

Islamabad - The US has threatened Pakistan that its envoy will be "kicked out" if it fails to release the American official arrested for gunning down two men in Lahore by Friday, according to a media report.

National security advisor Tom Donilon told Pakistani envoy Hussain Haqqani that the Obama administration will "kick him out of the US", close consulates in Pakistan and cancel President Asif Ali Zardari's upcoming visit to Washington if US official Raymond Davis is not released by Friday, ABC News channel quoted two unnamed Pakistani officials as saying.

Donilon reportedly conveyed the warning to Haqqani on Monday evening.

The "outlines of the threat" were also confirmed to ABC News by a senior US official who was not authorized to speak on the record.

The US has suspended all high-level bilateral talks with Pakistan over its refusal to grant diplomatic immunity to an American official.

Raymond Davis has been in prison since last month when he admitted to killing two men who he said tried to rob him in the city of Lahore.

Congress is threatening to cut off Pakistan's aid because Davis is a US embassy employee and should be immune from prosecution.

US Congressman Silvestre Reyes says reports that he may have been a spy on an espionage mission are irrelevant.

"I don't know what his job is, but I do know that he had diplomatic status. The issue of what he was doing at the time is not an issue for the government," he said.

"He was accosted by two criminals, known criminals with criminal records. He protected himself."

Islamabad - Pakistan's standoff with Washington over a jailed U.S. Embassy worker will not thwart talks between the two countries and Afghanistan, a Pakistani government spokesman said Sunday.

Tensions between the U.S. and Pakistan have been rising over the detention of American Raymond Allen Davis for killing two Pakistani men he says were trying to rob him.

In an apparent step to show its displeasure, the United States on Saturday postponed a meeting with Pakistani and Afghan officials to discuss the war in Afghanistan. Pakistan prizes such gatherings as a way to assert influence in Afghanistan.

The meeting was to have taken place next week. The U.S. did not directly cite Davis' continued detention as the reason, but U.S. diplomats have said the talks could become a casualty of the dispute.

Foreign Ministry spokesman Abdul Basit said he is confident the three-way talks will continue.

The scene could have been scripted in a Hollywood action thriller: For two hours at the end of last month in Lahore, U.S. diplomat Raymond Davis was closely pursued by two visibly armed men on a motorbike. He noticed them tailing him from a restaurant to an ATM, and through the crowded streets of Pakistan's second city. They were close by when, in a crowded intersection, Davis produced his own handgun and fired seven shots. The diplomat was apparently a crack shot, and all seven bullets found their mark, killing his two pursuers. Davis then called for back-up, and a four-wheel-drive vehicle raced onto the scene, striking a Pakistani bystander who was killed by the impact. But the people in the vehicle, whose identities remain unknown, escaped from the scene having failed to retrieve Davis, who was later arrested nearby. In custody, Davis has told Pakistani authorities that he acted in self-defense, and has invoked diplomatic immunity, an international convention that protects diplomats from prosecution in the countries where they serve.

Two weeks later, Davis remains behind bars, facing murder charges. And the incident has plunged the already troubled relationship between Washington and Islamabad to a new low. Pakistani officials say Secretary of State Hillary Clinton last week canceled a meeting with her Pakistani counterpart and is considering withdrawing an invitation for President Asif Ali Zardari to a trilateral summit with Afghan President Hamid Karzai later this month. But at home, Zardari faces intense pressure to prosecute Davis. The hitherto obscure employee of the U.S. Embassy in Islamabad has now become a lightning rod for the fierce anti-American sentiments shared by an overwhelming majority of Pakistanis.

The two men gunned down by US national Raymond Davis in Lahore last month were working for ISI which was tailing the American because he was spying and "encroaching on their turf", according to a media report. The two men were sent to track Davis by the ISI, which believed that he had crossed "a red line" and needed to be followed, four unnamed Pakistani officials were quoted as saying by ABC News. The men Davis shot had been following him for at least two hours and recorded some of his movements on their cell phone cameras, one of the Pakistani officials said.

In late January, Davis was asked to leave an area of Lahore restricted by the military, the officials said. Davis' cell phone was tracked and some of his calls were made to the Waziristan tribal area, where the Pakistani Taliban and a dozen other militant groups have a safe haven, one official said. Pakistani intelligence officials saw Davis as a threat who was "encroaching on their turf," the official was quoted as saying.

Egypt's army has threatened to arrest protesters in Cairo's Liberation Square where, despite clearance orders, citizens are still massed, refusing to leave until their demands are met.

The pro-democracy protesters have been cordoned off by police and military soldiers, reported a Press TV correspondent on Monday.

The protesters are demanding a clear timetable for the transfer of power to a civilian government.

They have called on the army to fulfill its promises following its takeover of power.

This comes as Egypt's military has refused to answer the protesters' call for a swift transfer of power to a civilian administration, saying it will rule by martial law until a presidential election is held in September.

Egypt's state media denied reports on Monday that former leader Hosni Mubarak was in a coma but admitted he was ill.

The Egyptian daily Al-Masry Al-Youm reported on Sunday that Mubarak was gravely ill and had slipped into a coma after mass protests forced him from power on Friday.

The 82-year-old former head-of-state is in a "severe psychological condition and is declining treatment, despite his illness," the pro-government Al-Gomhuria daily said, citing sources close to Mubarak.

Many aspects of Hosni Mubarak's life - from his health to his wealth to his daily whereabouts - were closely guarded secrets during his nearly 30 years as president of Egypt. After being ousted from office last week, not much has changed.

The Egyptian daily Al-Masry Al-Youm reported Sunday that Mubarak had slipped into a coma. The paper repeated rumors that the 83-year-old former head-of-state also fainted twice during his infamous I-won't-quit speech last week, delivered just a day before he did indeed step down.

Another report, from an Israeli French-language magazine named JSS News, claims that Mubarak was on death's door in a hospital in Baden, Germany. Mubarak has long been rumored to be suffering from cancer, and JSS News claims that he is already in the terminal phase of his cancer suffering.

Despite these rumors, an Obama administration official told a reporter at the Washington Post Sunday they believed he was actually in the seaside resort town of Sharm el-Sheikh, where he has long had a private residence. Egypt's prime minister also supported this report.