NEW : About half of U.S. cargo comes into Afghanistan via Pakistan , Pentagon says . Comment: Spokesman : `` We do n't think it 's a very serious problem Pakistan is very sensitive about U.S.-led military operations on its territory and issued a strong protest Monday . '' Pakistan says 3 of its soldiers were killed during NATO attack on insurgents .
NEW : About half of U.S. cargo comes into Afghanistan via Pakistan , Pentagon says . Comment: Spokesman : `` We do n't think it 's a very serious problem '' Pakistan says 3 of its soldiers were killed during NATO attack on insurgents .