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Mindanao State University bombing

ONGOING2023Mindanao State University, Marawi, Philippines3 SOURCESUPDATED JUL 2026
Illustrative

On the morning of December 3, 2023, an improvised explosive device detonated at around 7:30 a.m. during a Catholic Mass held at the Dimaporo Gymnasium of Mindanao State University (MSU) in Marawi, a Muslim-majority city in the Bangsamoro autonomous region of the southern Philippines. The Mass, presided over by Franciscan priest Benigno Flores Jr., who survived, had approximately 72 attendees. The explosion occurred after the Kyrie portion of the liturgy and killed four people — two college professors and two students — while injuring at least 50 others. Police stated the attack was not a suicide bombing. CCTV footage showed two suspected bombers arriving on a motorcycle about 27 minutes before the blast and remaining at the scene for roughly eight minutes; an eyewitness reported seeing a man place a bag believed to contain the explosive device. A bomb threat targeting Marawi, without a specified target, had reportedly circulated the night before.

MSU's gymnasium was used for Sunday Mass because the campus's small chapel could not accommodate the congregation. The university's unfenced, seven-barangay campus had operated under a special security arrangement that barred military and police deployment prior to the bombing. Marawi itself was the site of a five-month siege in 2017 between Islamic State-affiliated insurgents and the Armed Forces of the Philippines that killed more than 1,100 people.

On the day of the bombing, Islamic State claimed responsibility, a claim authorities said was still being validated; the Maute Group and Abu Sayyaf were also named as possible perpetrators. Authorities speculated the attack may have been retaliation for recent government operations against the Dawlah Islamiyah group, which had suffered numerous casualties in the weeks before the bombing. The Philippine National Police named several "persons of interest," including Arseni Lumen Membisa ("Lapitos") and Wahab Sandigan Macabayao, along with Kadapi Mimbesa ("Engineer"), an alleged explosives expert who had twice enrolled at MSU without completing his studies. None of these individuals have been reported as convicted. Jafar Gamo Sultan was arrested on December 6, 2023, and two additional suspects were arrested on December 9, 2023. On January 26, 2024, a suspect identified only as "Omar" was killed in a firefight with the Philippine Army; the AFP later confirmed on February 12, 2024, that Membisa had also died in that clash, based on information from a surrendered militant. The bombing prompted the suspension of MSU classes, evacuation of roughly 600 students, national and international condemnation, a Philippine House resolution labeling it a terrorist attack, and a joint PNP-AFP security operation. Pope Francis publicly prayed for the victims, who were later included in the Vatican's New Martyrs catalogue. Disinformation and hate speech concerns emerged following the attack, including a fabricated quote falsely attributed to a Bangsamoro government official.

Key facts

Victims
On file
Date
2023
Location
Mindanao State University, Marawi, Philippines
Case status
ongoing

Case timeline

  1. 2017

    Five-month siege in Marawi between Islamic State-affiliated insurgents and the Armed Forces of the Philippines killed over 1,100 people.

  2. 2023-12-02

    A bomb threat targeting Marawi reportedly circulated, without a specified target.

  3. 2023-12-03

    An improvised explosive device detonated during Catholic Mass at MSU's Dimaporo Gymnasium in Marawi at around 7:30 a.m., killing four people and injuring at least 50; Islamic State claimed responsibility the same day.

  4. 2023-12-04

    MSU classes and extracurricular activities suspended indefinitely; students and staff began being repatriated to home provinces.

  5. 2023-12-05

    Students and alumni gathered at the Dimaporo gymnasium to light candles for victims.

  6. 2023-12-06

    House of Representatives adopted Resolution 1504 condemning the bombing; suspect Jafar Gamo Sultan arrested in Marawi; Philippine Senate held closed-door briefing with security officials; CBCP day of mourning held.

  7. 2023-12-07

    AFP admitted a possible security failure 'in a way'; memorandum set in-person class resumption for December 11.

  8. 2023-12-09

    Two more suspects, referred to as 'Maausor' and 'Monatanda/Titing', arrested in Lumbayanague.

  9. 2023-12-11

    In-person classes resumed at MSU amid student objections and protests.

  10. 2024-01-16

    Muslim and Christian leaders held an interfaith meeting resulting in a joint statement condemning the bombing (through January 17, 2024).

  11. 2024-01-26

    Suspect known as 'Omar' killed along with eight other Dawlah Islamiyah members in a firefight with the Philippine Army in Piagapo, Lanao del Sur.

  12. 2024-02-12

    AFP confirmed suspect Arseni Lumen Membisa had been killed in the January 26 firefight, based on information from a surrendered militant.

  13. 2024-10-16

    Membisa, described as the last known suspect in the bombing, was reported arrested in a joint PNP-AFP operation in Iligan.

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People

  • Kadapi Mimbesa

    CHARGED

    Alleged explosives expert ('Engineer') believed to have planted the bomb inside the gymnasium; identified by a Mass attendee and university faculty as a former twice-enrolled MSU student.

  • Arseni Lumen Membisa

    CHARGED

    Identified by PNP as a person of interest ('Lapitos') accused of driving the motorcycle used to transport the bomb; alleged Dawlah Islamiyah/Maute Group member; reported killed in a February 2024 AFP account and later reported arrested in October 2024 per the source material.

  • Jafar Gamo Sultan

    CHARGED

    Arrested December 6, 2023 in Marawi; alleged companion of the person who placed the bomb, identified by an eyewitness as 'Omar'.

  • Wahab Sandigan Macabayao

    CHARGED

    Identified by PNP as a person of interest from the Dawlah Islamiyah/Maute Group in connection with the bombing.

Roles reflect public records and court outcomes at the time of writing — supporting citations are on file under Sources.

Places

Mindanao State University, Marawi, Philippines

7.9947, 124.2569

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Common questions

What happened to the victim?
On December 3, 2023, an improvised explosive device detonated during a Catholic Mass at the gymnasium of Mindanao State University in Marawi, Philippines, killing four people and injuring at least 50 others.
Where did the bombing happen?
Mindanao State University, Marawi, Philippines.
What is the current status of the case?
Status: ongoing. Last verified July 2026.
More cases in Philippines

Sources

  1. ENCYCLOPEDICMindanao State University bombingWikipedia · 2026-07-07
  2. PRESSThree dead in southern Philippines university gym blast - mediaReuters · 2026-07-07
  3. PRESSExplosion at Marawi State University in southern PhilippinesAssociated Press · 2026-07-07

Record history

First published
JUL 07, 2026
Last verified against sources
JUL 07, 2026