Joe Biden and Paul Ryan waged the most meaty foreign policy exchanges of the entire White House race in their vice presidential rumble, which exposed national security liabilities on both sides.

A prominent Sudanese author on Thursday accused state security agents of seizing his books from an international book fair in Khartoum.

A US Congressional report that warns two Chinese telecom companies pose a national security risk and should face restrictions in the US market is "groundless", China has said.

Bulgaria and the United States signed on Wednesday a deal aimed at improving the exchange of data needed to tackle "terrorism" and organised crime, three months after a still-unsolved deadly bomb attack on Israeli tourists.

On the eve of a grilling at Congress, the State Department hit back Tuesday at charges of security lapses in Libya, detailing a fierce attack on its Benghazi mission which it said erupted without warning.

Dozens of armed men invaded the US consulate in Benghazi last month setting it on fire and hunting down staff, US officials said in a dramatic, detailed account of the deadly assault in Libya.

Canada said Tuesday it had invoked a "national security exception" that could exclude China's Huawei Technologies from a role in helping build its new super secure government network.

The US Supreme Court let stand Tuesday an immunity law on wiretapping viewed by government as a useful anti-terror tool but criticized by rights activists as a flagrant abuse of executive power.

Three North Korean soldiers have defected to South Korea across the heavily-fortified border since August, media reports said on Tuesday, in an apparent embarrassment to Pyongyang's new regime.

Beijing on Monday urged Washington to "set aside prejudices" after a draft Congressional report said Chinese telecom firms Huawei and ZTE were security threats that should be banned from business in the US.

Chinese telecom giants Huawei and ZTE pose a security threat to the United States and should be barred from US contracts and acquisitions, a yearlong congressional investigation has concluded.

Sudan's President Omar al-Bashir on Sunday ordered land and river border crossings with South Sudan reopened, official radio said, after agreements signed last month that eased tensions between the neighbours.

Radical Islamist preacher Abu Hamza and four other terror suspects have finally been deported from Britain to the United States, Home Secretary Theresa May said Saturday.

The United States needs to develop offensive weapons in cyberspace as part of its effort to protect the nation from cyber attacks, a senior military official said Thursday.

Republican White House hopeful Mitt Romney will address foreign policy and national security in a major speech Monday in the key electoral battleground of Virginia, his campaign said.

An Israeli court on Thursday charged an Arab Israeli with gathering information for Lebanon's Hezbollah, including details of security arrangements for President Shimon Peres, the Shin Bet security agency said.

Human Rights Watch on Wednesday accused Gaza's ruling Hamas movement of "extensive" rights violations, including torture, warrantless and arbitrary arrests, and unfair trials.

An Afghan man who was wounded in a bomb blast while working as an interpreter for British forces won a reprieve on his asylum application Wednesday, hours after reports that his request was rejected.

A Chinese-owned company has filed suit against President Barack Obama for blocking its purchase of wind farms near a US military base on national security grounds, court documents made public showed.

A United States border agent on patrol along Arizona's border with Mexico was fatally shot and another was wounded Tuesday, officials said.