Camp Bastion, in southern Helmand province, came under mortar, rocket-propelled grenade and small arms fire late on Friday in an attack in which several servicemen were wounded. U.S. President Barack Obama has vowed to "stand fast" against violence which has spread since the amateurish film of obscure origin triggered an attack on the U.S. consulate in the Libyan city of Benghazi that killed the ambassador and three other Americans on September 11, the eleventh anniversary of the al Qaeda attacks on the United States. Britain's Prince Harry was at Camp Bastion at the time of Friday's attack, but was unharmed. Britain's Sky News said a Taliban commander had told the broadcaster that Prince Harry was main target of the attack. Sky's Kabul correspondent said she checked with a Taliban spokesman, who said the attack on Bastion was indeed in revenge for the Islam film, but that Bastion was chosen as the target because Prince Harry was there. Sky's correspondent in Cairo said he had received a fresh statement from a "senior Taliban spokesman/commander," saying that the confusion over the claims was because there were two Taliban groups attacking the base. "After saying this attack was mounted in reaction to the video on Islam, it is entirely predictable that the Taliban have changed their tune to say it was aimed at Captain Wales," a British defense source said on Saturday, referring to Prince Harry. The insurgents who mounted this attack, most of whom were killed by ISAF, were nowhere near Captain Wales, who, with other UK and ISAF personnel, was under lockdown. In a separate attack in Helmand province on Friday, a roadside bomb killed a British soldier, the Ministry of Defence said. It was not clear whether the explosion was related to a report by Helmand's governor that a roadside bomb had killed 12 civilians, including women and children, when their vehicle drove over an explosive device in the same area. Reporting by Jessica Donati and Mirwais Harooni in Kabul, Abdul Malek in Helmand and Phil Stewart in Washington; Editing by Michael Georgy and Nick Macfie