US Secretary of State Hillary Clinton has arrived in Pakistan on a previously¹ unannounced visit aimed at soothing² tensions between the two countries.

美国国务卿希拉里·克林顿在没有提前公开的情况下造访巴基斯坦，试图缓和两国之间的紧张局势。

Hillary Clinton is due to meet Pakistani leadership during her visit
It is the first such high-level visit to Pakistan since the killing³ of al-Qaeda leader Osama Bin⁴ Laden⁵ on 2 May.

The American special forces raid on Bin Laden's hideout（隐匿处） in Abbottabad prompted protests from Islamabad.

It comes a day after the US announced it was withdrawing some of its troops from Pakistan, at Islamabad's request.

The Pentagon said it had received a request from the Pakistani government to reduce its presence in the country.

Relations between US and Pakistan are always complex and fragile but they are particularly volatile⁶（不稳定的） at the moment.

In Washington, suspicion is rife⁷ that some in Pakistan knew of Osama Bin Laden's hiding place.

During her visit, Mrs Clinton is to meet Pakistani President Asif Ali Zardari, army chief General Ashfaq Kayani and Ahmad Shuja Pasha, chief of Pakistan's powerful intelligence agency ISI.

The secretary of state is accompanied by chairman of the US Joint⁸ Chiefs of Staff Admiral Mike Mullen.

They are expected to demand more co-operation from Pakistan in the fight against al-Qaeda and Taliban militants⁹.

Some in Washington believe that Pakistani intelligence works closely with violent extremist groups.

Meanwhile, US media reports say that Pakistan will allow the CIA to examine Bin Laden's compound in Abbottabad.

A forensics（辩论） team is expected to arrive within days along with sophisticated equipment to find material that may be embedded¹⁰ behind walls, inside safes or buried underground.

An incredible amount of intelligence was recovered during the raid, but officials said this could be an opportunity to find out more about al-Qaeda.

It could also help improve ties with Pakistan, they said.