Harakat al-Shabaab al-Mujahideen (HSM; Arabic: حركة الشباب المجاهدين‎‎, Ḥarakat ash-Shabāb al-Mujāhidīn; Somali: Xarakada Mujaahidiinta Alshabaab, lit. "Mujahideen Youth Movement" or "Movement of Striving Youth"), more commonly known as Al-Shabaab (Arabic: الشباب‎, lit. '"The Youth" or "The Youngsters"'‎), is a jihadist terrorist group based in East Africa. In 2012, it pledged allegiance to the militant Islamist organization Al-Qaeda. In February of the year, some of the group's leaders quarreled with Al-Qaeda over the union, and quickly lost ground. Al-Shabaab's troop strength was estimated at 7,000 to 9,000 militants in 2014. As of 2015, the group has retreated from the major cities, controlling a few rural areas.