Pakistan also has denounced Washington's decision as "counterproductive". The rhetoric from the US side has raised hackles in Islamabad, and fueled fears the row could undermine Pakistan's ongoing support for US operations in Afghanistan. On Friday, several hundred people gathered to protest and chant anti-US slogans in Chaman, one of the two main crossings on the border with Afghanistan. But Pakistan's foreign office issued a cautious statement in which it said it was "engaged" with US officials and awaiting further details.