From the article:
The Obama administration is assembling a constellation of secret drone bases for counterterrorism operations in the Horn of Africa and the Arabian Peninsula as part of a newly aggressive campaign to attack al-Qaeda affiliates in Somalia and Yemen, U.S. officials said….
The rapid expansion of the undeclared drone wars is a reflection of the growing alarm with which U.S. officials view the activities of al-Qaeda affiliates in Yemen and Somalia, even as al-Qaeda’s core leadership in Pakistan has been weakened by U.S. counterterrorism operations.
The U.S. government is known to have used drones to carry out lethal attacks in at least six countries: Afghanistan, Iraq, Libya, Pakistan, Somalia and Yemen.
