Investigators say the skies over the country are overcrowded with unmanned planes seeking terrorists.
The skies over Somalia have become so congested with drones that the unmanned aircraft pose a danger to air traffic and potentially violate a long-standing arms embargo against the war-torn country, according to U.N. officials.
In a recently completed report, U.N. officials describe several narrowly averted disasters in which drones crashed into a refugee camp, flew dangerously close to a fuel dump and almost collided with a large passenger plane over Mogadishu, the capital.
Although U.N. investigators did not directly pin the blame for the mishaps on the United States, the report noted that at least two of the unmanned aircraft appeared to be U.S.-manufactured and suggested that Washington had been less than forthcoming about its drone operations in Somalia.
The U.S. military has conducted clandestine drone flights over Somalia for years as part of a broader counterterrorism campaign against Al-Shabab, a group of Islamist fighters that controls much of the country and is affiliated with Al-Qaida.
Although the drone missions have long been an open secret, the Obama administration acknowledged last month for the first time that it "is engaged in a robust range of operations to target Al-Qaida and associated forces, including in Somalia."
The number of military drone flights over Somalia has increased substantially since the Air Force opened a new base last year in neighboring Ethiopia. The military opened a similar base in late 2009 in the Seychelles, an Indian Ocean archipelago off the eastern coast of Somalia.
Both of those operations complement a much bigger U.S. military drone base in Djibouti, a small country on Somalia's northwestern border on the Horn of Africa.
Somalia, a failed state stricken by famine and decades of civil war, has been largely off-limits to U.S. ground troops since 1993, when Somali fighters shot down two military helicopters and killed 18 Americans in the "Black Hawk Down" debacle.
In recent years, however, small teams of special operations forces and CIA operatives have gradually stepped up secret missions inside Somalia to rescue hostages and hunt for Al-Shabab leaders.
The U.N. Security Council imposed an arms embargo on Somalia in 1992, although it has carved out an exception for an African Union military force that has been battling Al-Shabab and propping up a transitional Somali government based in Mogadishu.
The U.N. Monitoring Group on Somalia, which prepared the new report, said that it considered the use of drones in that country "a potential violation of the arms embargo" because the aircraft are "exclusively military" in nature.
Spokesmen for the Pentagon and the State Department declined to comment on U.S. drone operations in Somalia.