The group expanded its operations to Malaysia in 2000, when it abducted foreigners from two resorts. This action was condemned by most Islamic leaders. It was responsible for the kidnapping and murder of more than 30 foreigners and Christian clerics and workers, including Martin and Gracia Burnham. A commander named Abu Sabaya was killed in 2002, while trying to evade local forces. Galib Andang, one of the group's leaders, was captured in Sulu in December 2003. An explosion at a military base in Jolo, on 18 February, 2006 was blamed on the group by Brig. General Alexander Aleo. Khadaffy was indicted in the United States District Court for the District of Columbia for his alleged involvement in terrorist attacks, including hostage-taking and murder, against United States nationals and other foreign nationals. Consequently, on 24 February 2006, Khadaffy was among six fugitives in the second and most recent group of indicted fugitives to be added to the FBI Most Wanted Terrorists list along with two fellow members, Isnilon Totoni Hapilon and Jainal Antel Sali Jr.
Question: What tactic was used for the base in Jolo?
Answer: explosion