LAHORE, Pakistan — Secretary of State Hillary Rodham Clinton, on a visit meant to improve relations with Pakistan, strongly suggested Thursday that some Pakistani officials bore responsibility for allowing terrorists from Al Qaeda to operate from safe havens along this country's frontier.

"I find it hard to believe that nobody in your government knows where they are, and couldn't get to them if they really wanted to," she said to a group of Pakistani journalists on her second day here. "Maybe that's the case; maybe they're not gettable. I don't know."