Pakistan ? Pakistan’s prime minister said Thursday that strikes by foreign forces were “counterproductive,” as officials said there was no warning about the latest U.S. missile strike in the Pakistani northwest.

Meanwhile, militants briefly seized 300 boys at a school in northwest Pakistan on Thursday, police said. The incident ended with the deaths of two suicide bombers; no children were harmed.

The missile strike Wednesday was part of a surge in U.S. cross-border operations, and it was especially galling to Pakistanis because it came the same day an American military leader assured the nation’s leaders the U.S. respects Pakistan’s sovereignty.

Pakistan’s civilian leaders stressed diplomacy to resolve the mounting tensions with an anti-terror ally that has given the Muslim nation billions of dollars in aid.