Another attack by a US assassination drone has claimed the lives of at least 28 civilians, while injuring dozens of others in southern Somalia, Press TV reports.

The incident took place in the town of Gilib, 350 kilometers south of Mogadishu, a Press TV correspondent reported on Sunday.

The Washington Post reported on Thursday: The Air Force has been secretly flying Reaper drones on counterterrorism missions from a remote civilian airport in southern Ethi­o­pia as part of a rapidly expanding U.S.-led proxy war against an al-Qaeda affiliate in East Africa, U.S. military officials said.

The Air Force has invested millions of dollars to upgrade an airfield in Arba Minch, Ethi­o­pia, where it has built a small annex to house a fleet of drones that can be equipped with Hellfire missiles and satellite-guided bombs. The Reapers began flying missions earlier this year over neighboring Somalia, where the United States and its allies in the region have been targeting al-Shabab, a militant Islamist group connected to al-Qaeda.

On Friday, the Pentagon said the drones are unarmed and have been used only for surveillance and collecting intelligence, though it would not rule out the possibility that they would be used to launch lethal strikes in the future.

Mindful of the 1993 “Black Hawk Down” debacle in which two U.S. military helicopters were shot down in the Somali capital of Mogadishu and 18 Americans killed, the Obama administration has sought to avoid deploying troops to the country.

As a result, the United States has relied on lethal drone attacks, a burgeoning CIA presence in Mogadishu and small-scale missions carried out by U.S. Special Forces. In addition, the United States has increased its funding for and training of African peacekeeping forces in Somalia that fight al-Shabab.

The Washington Post reported last month that the Obama administration is building a constellation of secret drone bases in the Arabian Peninsula and the Horn of Africa, including one site in Ethi­o­pia. The location of the Ethio­pian base and the fact that it became operational this year, however, have not been previously disclosed. Some bases in the region also have been used to carry out operations against the al-Qaeda affiliate in Yemen.