'Strain shows' as Clinton visits Pakistan
US Secretary of State Hillary Clinton has arrived in Pakistan on a visit aimed at soothing tensions between the two countries.
It is the first such high-level visit to Pakistan since the killing of al-Qaeda leader Osama Bin Laden on 2 May.
The BBC's Kim Ghattas said the strain on relations between Washington and Islamabad was clear to see with "no smiling, no chit chat" as talks began at the presidential palace.