THE United States and Britain closed their embassies in Yemen yesterday over security concerns about possible militant attacks after the failed bombing of a US-bound plane on Christmas Day. The US Embassy said it had received a threat by al-Qaeda, which US intelligence agencies believe has a growing presence in the Arab country.

A British Foreign Office spokeswoman cited security reasons for the embassy's closure but declined to say if any specific threat had been made.

Yemen has already tightened security on its coastline to stop insurgents infiltrating from Somalia and held talks with a US general on strengthening cooperation.

But Foreign Minister Abubakr al-Qirbi said his government was not coordinating strikes against al-Qaeda with the United States.

Western allies have sought to bolster Yemen's government, which faces facing a Shia rebellion in the north and a separatist movement in the south, for fear that al-Qaeda might exploit its instability to launch more attacks across the globe.

A Nigerian man, charged with trying to bomb a Detroit-bound passenger plane on Christmas Day, is believed to have received training from the radical group in Yemen.

Al-Qaeda said the attempt was in retaliation for US involvement in Yemen and its military support for the government, which has launched an offensive against the militants.

The US Embassy told its Yemeni staff to stay in their homes yesterday.

"The US Embassy in Sana'a is closed today, January 3, 2010, in response to ongoing threats by al-Qaeda in the Arabian Peninsula (AQAP) to attack American interests in Yemen," a statement on the embassy website said.

Spain's embassy in Yemen has restricted access but remains open, the Spanish government said. El Mundo newspaper said the embassy would be closed to the public today.

In Washington, a senior aide to President Barack Obama said the United States has indications al-Qaeda was planning an attack against a target in Sanaa. "We know that al-Qaeda is out there. We know we have to mind our steps," homeland security and counterterrorism aide John Brennan told CNN.

US officials have said Washington was looking at ways to expand military and intelligence cooperation with Yemen to increase pressure on al Qaeda militants in the Arabian Peninsula.

Foreign Minister Qirbi, quoted by the state news agency, said Yemen was cooperating with foreign countries in exchanging information and training.

Asked if Yemen had agreed to allow US missiles and aircraft to strike al-Qaeda targets in Yemen, Qirbi said: "There is no agreement with the United States in this regard."

Washington has already increased training, intelligence and military equipment provided to Yemeni forces, helping them to stage raids against suspected al-Qaeda hideouts last month. General David Petraeus, head of the US Central Command, said last week that Washington would more than double its US$70 million security assistance to Yemen.

Northern Shia rebels from the Zaidi sect have been fighting government troops in Yemen's mountainous north since 2004, complaining of marginalisation. The conflict has killed hundreds and displaced tens of thousands.

In the mainly Sunni Muslim south, Yemen has also clashed with separatist protesters seeking independence for southern Yemen, which unified with its northern neighbour in 1990 and failed to secede in a 1994 war.

In London, British airport operator BAA said it would move quickly to install full-body scanners at Heathrow airport after the failed Christmas Day attack. Reuters