Signature targets

U.S. officials said that Obama approved the use of “signature” strikes  The expanded authority will allow the CIA and JSOC to fire on targets based solely on their intelligence “signatures” — patterns of behavior that are detected through signals intercepts, human sources and aerial surveillance, and that indicate the presence of an important operative or a plot against U.S. interests.

Until now, the administration had allowed strikes only against known terrorist leaders who appear on secret CIA and JSOC target lists and whose location can be confirmed.

For eight years, the United States has conducted but never formally acknowledged a program to kill terrorists associated with Al Qaeda and the Taliban away from the battlefield in Afghanistan. Using drones, the Central Intelligence Agency has made 320 strikes in Pakistan since 2004, killing 2,560 or more people, including at least 139 civilians. Another 55 st