A security source has denied reports that wanted Saudi national Abdullah Al-Juwayyer was among the 10 people arrested following a raid on a house in the Hadhramawt city of Mukalla last Monday. The source said that Abdullah Farraj Muhammad Mahmoud Al-Juwayyer, number 46 on the Saudi Ministry of Interior's 2009 list of wanted terrorism suspects and known by his nom-de-guerre “Abu Ibrahim”, was still being pursued by the authorities. According to the source, a security raid on a house in west Mukalla's Fawah area led to the detention of the house owner and his brother, while another eight persons were detained in the days that followed. “The security authorities had monitored their movements and captured a number of them,” the source said. “They are currently in pursuit of the rest.” Officials, the source said, were scouring the valley in the region of Fawah where a number of Al-Qaeda members are believed to be hiding after escaping during last Monday's raid. The Ministry of Interior in Yemen has said that the terrorist cell had plans to target security offices and installations in the province of Hadhramaut and that the raid uncovered a suicide vest ready for use in a terrorist operation the following day. Investigations with the captured members revealed the identity of Saudi national Al-Juwayyer as among their group and documents recovered from the house during the raid were described as of “great significance” in the capture of other Al-Qaeda members in Yemen and the pursuit of other terrorist cells. Meanwhile, Al-Qaeda claimed responsibility Sunday for a gun and mortar attack on the southern headquarters of a Yemeni intelligence agency, saying it was revenge for a government assault on an Al-Qaeda stronghold. Firing automatic weapons and mortars, gunmen attacked the security building in Aden on June 19, killing at least 11 people. The attack was the bloodiest in Yemen since the bombing of the USS Cole in 2000 that killed 17 US sailors. “This attack comes as a response to the tyrannical aggression that reached our people in Maarib province and deliberately humiliates the tribes with the pretext of fighting terrorism,” a statement from Al-Qaeda's Yemen-based regional wing said in a statement posted on an Islamist website. The June attack in Aden came a day after Al-Qaeda threatened to respond to a state crackdown against it in the remote Maarib province.