US Secretary of State Hillary Clinton is expected to arrive in Pakistan on Friday to improve relations after recent tensions over a covert US raid that killed terrorist leader Osama bin Laden, Pakistani and US officials said on Thursday according to dpa. Clinton is expected to meet President Asif Ali Zardari, Prime Minister Yousuf Raza Gilani and military leadership on Friday. The high level visit is the third from the US this month aimed at building trust after relations plummeted due to secret operation that killed bin Laden in Abbottabad, some 60 kilometres north-east of capital Islamabad on May 2.