By 8:20 p.m., the inmates had breached the holding blocks and swarmed the investigation building. Of the thirteen officers inside, seven fought their way out with injuries. Six were captured. Five were killed. The sixth, a policeman named Iwan, was held as a hostage -- a bargaining chip whose value the inmates understood immediately. When negotiations began at 9:15 p.m., police demanded the release of the hostages, unaware that five of them were already dead. The police offered medical treatment for two injured inmates and threatened to attack if no agreement was reached. The inmates refused. By midnight, images began circulating on social media: detainees holding seized firearms, a black Islamic State flag draped behind them, wounded men nursing their injuries alongside their captive. Brimob officers sealed the surrounding streets and extended extra security to a nearby church and hospital, preparing for the possibility that the violence might spread beyond the prison walls.

The standoff that unfolded over the next two days revolved around a single demand. The inmates wanted to speak with Aman Abdurrahman, the most influential Islamic State-aligned cleric in Indonesia, who was himself imprisoned at the facility. Their representative, Abu Umar, first made the request at 1:30 a.m. on May 9. He made it again at 8:15 a.m. And again that evening. Each time, the inmates promised to release their remaining hostage -- but feared that surrendering Iwan would invite an immediate assault on the cell block. The fear was not irrational. Indonesia's elite counterterrorism unit, Densus 88, was on site and issued explicit warnings of an imminent attack. At 10:30 p.m. on May 9, Abu Umar told officers he would release the hostage if the meeting with Aman Abdurrahman was granted. Police agreed. At 11:15 p.m., Iwan was released and taken to the hospital. The concession had worked -- but the crisis was not over.

The early hours of May 10 brought the standoff to its conclusion. At 1:30 a.m., police warned they would attack within a short period of time. At 2:40 a.m., the inmates' representative requested another meeting to convey their intention to surrender. By 5:30 a.m., they were discussing the logistics of handing over weapons. At 6:45 a.m., the detainees walked out of the detention center and laid down their arms: 26 weapons and approximately 300 rounds of ammunition, all of which they had seized from the facility's own armory during the initial assault. The numbers were staggering for a prison takeover. That these weapons were accessible to inmates at all raised immediate questions about security protocols at Mako Brimob, one of the most heavily guarded police facilities in Indonesia.

The violence did not end with the surrender. Hours later, a suspected Islamic militant approached the Mako Brimob headquarters and fatally stabbed a police officer who had stopped to question him. The assailant, carrying a concealed knife, was shot and killed. In total, six police officers died and four were injured across the three-day crisis. One inmate was killed by police gunfire. The Islamic State claimed the standoff as the work of its fighters, adding Indonesia to the list of countries where the group's imprisoned followers had struck from within the justice system. Public anxiety extended beyond the immediate violence. Jakarta's former governor, Basuki Tjahaja Purnama, was serving a sentence at Mako Brimob on a politically motivated blasphemy conviction. Police reported that he was safe, but acknowledged suspicions that the attackers had planned to target him as well. The incident prompted a national conversation about the risks of concentrating convicted terrorists in a single facility, where radical networks could organize and charismatic leaders like Aman Abdurrahman could exert influence over fellow inmates.

Mako Brimob sits in Depok, a satellite city on the southern edge of Jakarta's vast metropolitan sprawl. The Mobile Brigade Corps is the tactical unit of the Indonesian National Police, trained for crowd control, counterterrorism, and high-risk operations. Its headquarters doubles as a detention facility for some of the country's most dangerous prisoners, a dual function that the May 2018 standoff called sharply into question. From the air, the compound is a cluster of low buildings and parade grounds amid the dense residential fabric of Depok, unremarkable except for its perimeter fencing and the military vehicles parked inside. Nothing about its appearance suggests the intensity of what unfolded within its walls over three days in May -- the negotiations, the ultimatums, the five officers who died before the talking even began.