The Islamic States radio station released a statement on Saturday claiming that two of the groups followers had carried out the shootings that left 14 people dead in San Bernardino, Calif., on Wednesday.
It was the first official claim of responsibility by the group after days of congratulatory messages posted on Twitter and a statement published on a news forum believed to be run by members of the Islamic State, which is also known as ISIS or ISIL.
In its English-language broadcast, the Islamic States Bayan radio station referred to the couple who carried out the attack as soldiers of the caliphate, a term denoting members of the terrorist groups army.
The Islamic State group has used the same term to refer to gunmen who have carried out attacks in its name, including Elton Simpson and Nadir Soofi, who fired on a site hosting a Prophet Muhammad cartoon competition in Garland, Tex., in May.