NEW : About half of U.S. cargo goes into Afghanistan via Pakistan , Pentagon says . ISAF spokesman says the Gate in the Khyber Agency is closed . `` We do expect these matters to be resolved . '' Spokesman : ` ` We do n't think it 's a very serious problem '' Pentagon says 3 of its soldiers were killed during NATO attack on Afghanistan .
NEW : About half of U.S. cargo goes into Afghanistan via Pakistan , Pentagon says . ISAF spokesman says the Gate in the Khyber Agency is closed . Spokesman : ` ` We do n't think it 's a very serious problem '' Pentagon says 3 of its soldiers were killed during NATO attack on Afghanistan .