Gunmen attacked NATO oil tankers stranded in southwest Pakistan for the second time in days

Gunmen attacked NATO oil tankers stranded in southwest Pakistan for the second time in days as Islamabad warned it could enforce its blockade of the US lifeline into Afghanistan for weeks.
  
The attackers destroyed seven tankers in a blaze of fire late Sunday, the second attack in four days in Pakistan's volatile region of Baluchistan.

There was no claim of responsibility but Pakistan's fragile alliance with the United States crashed to new lows after November 26, when NATO air strikes killed 24 Pakistani soldiers in what Pakistan called a deliberate attack.
  
Islamabad sealed its Afghan border to NATO convoys, closures that entered an 17th day on Monday, forcing trucks back to the Arabian Sea port of Karachi.

Last Thursday, gunmen destroyed at least 34 trucks in a gun and rocket attack at a temporary NATO trucking terminal in Quetta.

Prime Minister Yousuf Raza Gilani told the BBC that Pakistan's blockade of the border, already the longest since the 2001 US-led invasion of Afghanistan, will not be lifted until new "rules of engagement" were agreed with Washington. "We want to set new rules of engagement and cooperation with United States. We have a resolve to fight against terrorism and therefore we want to set new rules of engagement," he added in the interview aired Sunday.