ISLAMABAD British Airways has suspended all its flights to Pakistan because of security fears after the Islamabad blast, an airline spokesman said on Monday.

'Our people at headquarters are reviewing the security situation,' said airline spokesman Sohail Rehman.

In a sign of growing international unease about deteriorating security in nuclear-armed Pakistan, British Airways said it had suspended its six flights a week to the country.

The bombing has also raised fresh calls for Pakistan's government to rethink its alliance with the United States and military operations against Islamist militants, which many Pakistanis blame for inciting violence.

There has been no claim of responsibility but the government said it expected the investigation would lead to al Qaeda and Taliban militants in the Federally Administered Tribal Areas on the Afghan border.