Bomber Ramzi Yousef trains with members of the Abu Sayyaf, a Philippine militant group. He sneaks into the Philippines by boat to the southern island of Basilan, where Abu Sayyaf influence is strong. He tries to teach about 20 Abu Sayyaf operatives about explosives, but is frustrated by their inability to learn. After a few weeks, he goes to Manila to make the bombs needed for the planned Bojinka plot (see January 6, 1995) himself. However, some Abu Sayyaf militants are involved in the Bojinka plot, though details of their exact roles are scarce (see Late 1994-January 1995). There will be additional training in December 1994, involving five Filipinos and more foreigners (see January 3, 1995). [Reeve, 1999, pp. 72; Ressa, 2003, pp. 25-28] Trusted al-Qaeda operative and fellow Bojinka plotter Wali Khan Amin Shah also trains the Abu Sayyaf. [Miller, Stone, and Mitchell, 2002, pp. 139]