On May 27, 2001, an Abu Sayyaf raid kidnapped about 20 people from Dos Palmas, an expensive resort in Honda Bay, taking them to the north of Puerto Princesa City on the island of Palawan, which had been "considered completely safe". The most "valuable" hostages were three North Americans, Martin and Gracia Burnham, a missionary couple, and Guillermo Sobero, a Peruvian-American tourist who was later beheaded, following a $1 million ransom demand. The hostages and hostage-takers then returned to Abu Sayyaf territories in Mindanao. According to Bowden, the leader of the raid was Abu Sabaya. According to Gracia Burnham, she told her husband "to identify his kidnappers" to authorities "as 'the Osama bin Laden Group,' but Burnham was unfamiliar with that name and stuck with" Abu Sayyaf. After returning to Mindanao, Abu Sayyaf conducted numerous raids, including one that culminated in the Siege of Lamitan and "one at a coconut plantation called Golden Harvest; they took about 15 people captive there and later used bolo knives to hack the heads off two men. The number of hostages waxed and waned as some were ransomed and released, new ones were taken and others were killed."