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Afghan President Hamid Karzai (R) shakes hands with UK Prime Minister David Cameron (L) at a joint news conference at the Presidential Palace in Kabul on June 10, 2010. AFP Image Credit: AFP

Kabul: British Prime Minister David Cameron arrived in Afghanistan for talks with President Hamid Karzai on Thursday, his first visit as prime minister to a country that his new coalition government has set as its top foreign policy priority.

In the month since he took power at the head of a Conservative-Liberal Democrat coalition, Cameron has been conducting an intensive assessment of the situation in Afghanistan where Britain has 9,500 troops, the second-biggest foreign contingent after that of the United States.

Rising casualties - nearly 300 British soldiers have been killed in Afghanistan since 2001 - are eroding British public support for the war while its cost is straining Britain's finances at a time when the new government is searching for deep spending cuts to rein in a gaping budget deficit.

"No one wants British troops that stay in Afghanistan for a day longer than is necessary," Cameron told a joint news conference with Karzai at the presidential palace.

"What we want - and is our national security interest - is to hand over to an Afghanistan that is able to take control of its own security."

The number of foreign troops in Afghanistan is about to peak at around 150,000 but the death of 18 international soldiers this week alone shows that the Taliban are at their strongest since they were overthrown in the 2001 US-led invasion.

In the insurgent heartland of Kandahar, a suspected Taliban suicide bomber killed at least 40 people at a wedding party on Wednesday night, police officials said. Many of the guests had links to local authorities that cooperate with Western forces.

In the past month, Karzai has visited Cameron in Britain, three senior British ministers have made a fact-finding trip to Afghanistan and Cameron's newly created National Security Council has devoted several sessions to the Afghan conflict.

Cameron's government has said it will give US President Barack Obama's counter-insurgency strategy in Afghanistan time to work, but British officials are looking at what could be done more effectively.