(CNN) -- Al Qaeda's branch in Yemen has claimed responsibility for Friday's suicide bombing attack on a building housing Yemeni security forces.



Al Qaeda in Yemen have claimed that Ahmed bin Said bin Omar al-Mashjari, right, carried out Friday's attack.



"This attack was carried out in revenge for our brothers whose blood is on the hands of the infidel Yemeni forces," according to an e-mailed statement that included a photo of the alleged suicide attacker.



The photo identifies the attacker as Ahmed bin Said bin Omar al-Mashjari -- also known as Abu Dajjana al-Hadarmi -- from Yemen's Hadramout governate where the attack took place.



He is standing next to another man whose face is covered in front of a black-and-white banner. Both men have weapons slung across their shoulders; guns and ammunition belts are also pictured beneath the banner in the background. Al-Mashjari is wearing a black and white head covering, but his face is visible.



The e-mailed statement was dated July 25, the day of the attack, but it was distributed and posted online on Sunday.



According to Yemen's state-run news agency SABA, a suicide car bomber crashed the white 2003 KIA into the gates of the security camp in the southern city of Sayoun on Friday, prompting guards to open fire on the attacker.



The SABA report gave no details on casualties. Yemen's Interior Ministry said four people were killed and 12 were injured, but the Yemen Post, an English-language newspaper that covers events in Yemen, put the number at 10 dead and about a dozen wounded.



Hadramout's governor Saleh al-Khanbashi described the bombing as a criminal terrorist act, and threatened to track down and bring to justice those responsible, SABA reported.



CNN Senior Arab Affairs Editor Octavia Nasr contributed to this report
Who planted the bomb? what type of bomb was it? How many died? who is taking responsibility? Al Qaeda's Yemen claims?
Ahmed bin Said bin Omar al-Mashjari suicide car bomber 10 Al a building housing Yemeni security forces.
question: Who planted the bomb?, answer: Ahmed bin Said bin Omar al-Mashjari | question: what type of bomb was it?, answer: suicide car bomber | question: How many died?, answer: 10 | question: who is taking responsibility?, answer: Al | question: Al Qaeda's Yemen claims?, answer: a building housing Yemeni security forces.