The New York Times reports: The United States military is preparing to establish a drone base in northwest Africa so that it can increase surveillance missions on the local affiliate of Al Qaeda and other Islamist extremist groups that American and other Western officials say pose a growing menace to the region.

For now, officials say they envision flying only unarmed surveillance drones from the base, though they have not ruled out conducting missile strikes at some point if the threat worsens.

The move is an indication of the priority Africa has become in American antiterrorism efforts. The United States military has a limited presence in Africa, with only one permanent base, in the country of Djibouti, more than 3,000 miles from Mali, where French and Malian troops are now battling Qaeda-backed fighters who control the northern part of Mali.

A new drone base in northwest Africa would join a constellation of small airstrips in recent years on the continent, including in Ethiopia, for surveillance missions flown by drones or turboprop planes designed to look like civilian aircraft.

If the base is approved, the most likely location for it would be in Niger, a largely desert nation on the eastern border of Mali. The American military’s Africa Command, or Africom, is also discussing options for the base with other countries in the region, including Burkina Faso, officials said.

The immediate impetus for a drone base in the region is to provide surveillance assistance to the French-led operation in Mali. “This is directly related to the Mali mission, but it could also give Africom a more enduring presence for I.S.R.,” one American military official said Sunday, referring to intelligence, surveillance and reconnaissance.

A handful of unarmed Predator drones would carry out surveillance missions in the region and fill a desperate need for more detailed information on a range of regional threats, including militants in Mali and the unabated flow of fighters and weapons from Libya. American military commanders and intelligence analysts complain that such information has been sorely lacking.

The Africa Command’s plan still needs approval from the Pentagon and eventually from the White House, as well as from officials in Niger. American military officials said that they were still working out some details, and that no final decision had been made. But in Niger on Monday, the two countries reached a status-of-forces agreement that clears the way for greater American military involvement in the country and provides legal protection to American troops there, including any who might deploy to a new drone base.

The plan could face resistance from some in the White House who are wary of committing any additional American forces to a fight against a poorly understood web of extremist groups in North Africa.

If approved, the base could ultimately have as many as 300 United States military and contractor personnel, but it would probably begin with far fewer people than that, military officials said.

Some Africa specialists expressed concern that setting up a drone base in Niger or in a neighboring country, even if only to fly surveillance missions, could alienate local people who may associate the distinctive aircraft with deadly attacks in Pakistan, Somalia and Yemen.

Last June, a Washington Post report noted that: conventional aircraft hold two big advantages over drones: They are cheaper to operate and far less likely to draw attention because they are so similar to the planes used throughout Africa.

The bulk of the U.S. surveillance fleet is composed of single-engine Pilatus PC-12s, small passenger and cargo utility planes manufactured in Switzerland. The aircraft are not equipped with weapons. They often do not bear military markings or government insignia.

The Pentagon began acquiring the planes in 2005 to fly commandos into territory where the military wanted to maintain a clandestine presence. The Air Force variant of the aircraft is known as the U-28A. The Air Force Special Operations Command has about 21 of the planes in its inventory.