Speaking at a Mogadishu mosque last Friday, an al-Shabab official labeled VOA editor Abdi Yabarow and BBC editor Yusuf Gara Omar as murtadeen, or one who abandons the Islamic faith.
The official apparently did not make a direct call for violence, but al-Shabab loyalists have been known to target people labeled as murtadeen.
The speaker, Shiekh Fu'ad Mohamed Khalaf Shongole, also accused the editors of using propaganda and pro-western information to mislead Somali Muslims.
In a statement Wednesday, the chief of VOA's Africa division, Gwen Dillard, called the comments "unfortunate and incorrect." She said VOA's mandate is to serve the interest of all Somalis with objective, accurate information.
Al-Shabab, which controls portions of southern and central Somalia, has attempted to limit Somalis' access to VOA and the BBC.
The group recently told local media networks to end contracts with the two agencies. Al-Shabab also shut down FM radio stations that relay BBC programs. VOA is still being heard through a Somali government-run FM station and through shortwave and the Internet.
VOA is funded by the U.S. government and the BBC is funded by the British government.
Al-Shabab is the most prominent of the militant groups trying to overthrow the Somali government and set up a strict Islamic state. The group has proclaimed itself an ally of al-Qaida.