U.S. Special Forces Strike In Pakistan

Pakistan's top security officials on Wednesday were searching for clues that a "moderately important terrorist target" may have been hit when U.S. and/or NATO forces attacked three houses in a remote part of the country's border region with Afghanistan.

As many as 15 people were killed in the early morning strike Wednesday.

This was a commando raid by U.S. special operations forces - the first known use of ground troops inside Pakistan - in an attempt to kill or capture a high value target, reported CBS News national security correspondent David Martin. Until Wednesday, all known attempts to kill terrorist leaders operating out of Pakistan had been conducted by unmanned drones.