The inmates were part of the prison gang called the Wild Boys of DaPeCol, led by Felipe Pugoy and Mohammad Nazir Samparani.

Pugoy's group demanded a plane to Manila to engage in dialogue with then-President Corazon Aquino to request a transfer to the National Penitentiary in Muntinlupa due to alleged abuse by DaPeCol prison officials.

[2] The final two hostage takers reportedly surrendered after they were promised a transfer to the National Penitentiary and were detained along with the rest of the convicts.

Gen. Mariano BaccaySouthern Mindanao regional commander Lt Col. Franco CalidaDavao Metrodiscom Chief Rodrigo Duterte[3]Davao City Mayor Jesus Dureza[3]Davao 1st district Representative On August 13, 1989, 16 convicts including leaders Pugoy and Mohammad Nazir Samparani, a former sergeant from the Philippine Air Force who was dismissed from service in a 1976 hostage crisis, took 15 members of the Joyful Assembly of God as hostage.

[1][7][8] The Wild Boys took the hostages to protest against prison conditions and demanded to speak with Congressman Ramon Mitra and Senator Nina Rasul.

It was reported that photographers covering the event witnessed a soldier delivering a coup de grace to a wounded inmate hostage taker.

[6] Committee on Defense chairman, Senator Ernesto Maceda sent a team led by Gen. Felix Brawner to Davao City to investigate and interview the negotiators involved.

The team found that this led to the sole security guard, CIC Antonio Alcazar, to be compromised by the prisoners who took his M-16 ArmaLite rifle.

Maceda noted the lack of training of local civilian officials in handling the crisis and expressed surprise at their decision to give a shoot-to-kill order against the hostage takers.

The shooting by the rescue and assault team was also found to be deliberate with 7 either dead or wounded in a wide area among a circle of 30 people.

[10] Finally, the team recommended that the military review the security measures in all detention centers and the training of personnel tasked to handle detainees.

A medical examination by the Davao Doctors Hospital described the cause of victim's death as "a gunshot wound from the back of the left chest region exiting near the collarbone" contradicting early reports that she was killed by a slashed throat.

[12] An autopsy conducted on Hamill's corpse found that the fatal bullet that hit the missionary had an upward trajectory and could not have been caused by a military sniper which had an elevated position.

At around 3:15 p.m, some minutes after the troops stormed in the prison, Major Nonito Serrano found Hamill wounded and brought her into the adjoining administration building.

[13] Hamill was a member of Christian City's Girraween Pentecostalist church in New South Wales which had been sending missionary groups of 30–40 people to the Philippines since 1986.

[6] The mayor of Davao at the time, Rodrigo Duterte (who later became President of the Philippines) was among the civilian officials who were part of the negotiating team.

He described the death of the 5 hostages as "most unfortunate" and added that the order was to save lives and to apprehend the hostage-takers but that they would be shot if they resisted.

[11] Philippine authorities were urged by Evans to investigate to determine the source of Hamill's fatal wound and have those responsible charged.

Digong: The Refuge of the Oppressed and Abused) by KC Cordero and JM Estrabela, illustrated by Karl Comendador which narrated an account of the April and August 1989 hostage incidents involving Davao City Mayor, Rodrigo Duterte.

[16] In 2016, 27 years after the incident, Duterte made remarks in one of his campaign rallies relating to the 1989 hostage crisis and the raping of the Australian missionary.

Duterte made the controversial joke on April 12, when he talked to a crowd about Australian missionary Jacqueline Hamill who had been kidnapped, raped and killed in 1989 and said, "She was so beautiful.