A US raid killed one of Africa's most wanted al-Qaida suspects sought in connection with a deadly hotel bombing, and Somalia's powerful insurgent group vowed Tuesday to avenge the American attack. Two senior members of al-Shabab, who asked that their names not be used because they are not authorized to speak publicly, said their fighters will retaliate for the raid that killed Saleh Ali Saleh Nabhan on Monday. "They will taste the bitterness of our response," one of the commanders told The Associated Press in a telephone interview. The commando-style action took place amid growing concerns that al-Qaida is gaining a foothold in this lawless nation. Many experts fear Somalia is becoming a haven for al-Qaida, a place for terrorists to train and gather strength much like Afghanistan in the 1990s. Last year, US missiles killed reputed al-Qaida commander Aden Hashi Ayro - marking the first major success after a string of US military attacks in 2008. Nabhan is a Kenyan wanted for questioning in connection with the car bombing of a beach resort in Kenya and the near simultaneous attempt to shoot down an Israeli airliner in 2002. Ten Kenyans and three Israelis were killed in the blast at the hotel. The missiles missed the airliner. Two US military officials said that forces from the US Joint Special Operations Command were involved in Monday's raid in southern Somalia. The officials gave no details about the target, and they spoke on condition of anonymity because the operation was secret. But the deputy mayor for security affairs in Somalia's capital, citing intelligence reports, confirmed Nabhan was killed. Abdi Fitah Shawey did not elaborate. Somali witnesses to Monday's raid say six helicopters buzzed an insurgent-held village near Barawe, some 155 miles (250 kilometers) south of Mogadishu, before two of the aircraft opened fire on a vehicle, killing two and wounding two. Ernst Jan Hogendoorn, Horn of Africa Project Director of the International Crisis Group, said the "surgical" precision of Monday's raid shows that US has specific intelligence in Somalia. "I think it will certainly make al-Shabab leaders much more cautious when they are operating because obviously the United States has very precise intelligence about their movements," he said. Like much of Somalia, Barawe and its surrounding villages are controlled by the militant group al-Shabab, which the US accuses of having ties to al-Qaida. Al-Shabab, which has foreign fighters in its ranks, seeks to overthrow the government and impose a strict form of Islam in Somalia. The UN-backed government, with support from African Union peacekeepers, holds only a few blocks of Mogadishu, the war-ravaged capital.