Taliban warns foreign companies to leave Pakistan, amid army offensive
As militants pledge retaliatory action against government following military strikes in tribal area, major cities step up security amid threats

The Pakistani Taliban has warned foreign firms to leave the country and vowed retaliatory strikes against the government after tanks, ground troops and jets were deployed in a long-awaited offensive in a troubled tribal district.
Military jets pounded targets in the country's northwest yesterday as the armed forces launched strikes against militants' safe havens that killed 37 fighters, while insurgents fought back with a roadside bomb that killed six soldiers, the first army casualties of the operation, the military said.
Prime Minister Nawaz Sharif defended the operation. "We have decided to make Pakistan as a land of peace. I believe that this operation would be the beginning of an era of peace and tranquility."
Pakistan's major cities braced for revenge attacks by ramping up security at key installations and ordering soldiers to patrol the streets, while hospitals in the northwest prepared for incoming casualties.
The offensive on North Waziristan, a stronghold of Taliban and al-Qaeda militants, was launched a week after a brazen insurgent attack on Pakistan's main airport in Karachi which left dozens dead and marked the end of a troubled peace process.
Pakistan's Western allies, particularly the United States, have long demanded an operation in the mountainous territory to flush out groups like the Haqqani network which use the area to target Nato troops in neighbouring Afghanistan.