JAKARTA, Indonesia—Inmates at a detention center for terrorists, including Islamic State supporters, killed five police officers and took one hostage, police said Wednesday, in a bloody security breakdown that marked the single deadliest attack against Indonesian police.

Police spokesman Brig. Gen. Muhammad Iqbal said that one prisoner was killed in the fighting and that officials were in negotiations with the other inmates involved in the attack.

...</s>Five Indonesian police officers and a prisoner were killed in clashes at a high security jail that saw Islamist inmates take an officer hostage, authorities said Wednesday, with negotiations underway to secure his release.

The deadly riot broke out late Tuesday at the facility inside the Mobile Police Brigade headquarters in Depok on the outskirts of Jakarta.

It comes several days after the arrest of three terror suspects accused of plotting to attack the police headquarters and other facilities in the same area.

"There have been six fatalities -- five of our comrades are dead and one of them also (died)," said national police spokesman Muhammad Iqbal.

"One of our officers is still being held hostage. To prevent things from getting worse, we're going to keep negotiating so we don't have to go to the last resort," he added, without elaborating.

A dispute broke out after several prisoners demanded that they be given food sent to them by their families and managed to grab some of their jailers' firearms, authorities said, adding that the secure facility was on lockdown.

Some of the prisoners involved in the clashes are Islamist militants jailed on terror-related charges, according to police.

However, authorities rejected a claim from the Islamic State (IS) group made through its Amaq News Agency that it was responsible for the riot.

"Those (IS) claims are not true at all," Iqbal told reporters on the scene.

"The trigger (for the riot) was food, which must be checked to make sure there is not other stuff hidden inside it."

Police said they would hold a press conference later Wednesday.

Among the facility's prisoners is Aman Abdurrahman, an Islamic radical jailed for orchestrating an attack in Jakarta in 2016 that left eight people dead.

Former Jakarta governor Basuki Tjahaja Purnama, who was sentenced two years in prison for blasphemy after losing a re-election bid, is also held in the jail.

Abdurrahman and Purnama, better known as Ahok, are not housed in the part of the prison where the riot broke out.

Indonesia's overcrowded prisons are notorious for their poor conditions and outbreaks of violence.

Two years ago, nearly 500 inmates broke out from a prison after complaining about overcrowding and extortion.</s>Six people have been confirmed dead in a riot in a high-security prison outside Indonesia's capital, Jakarta.

Of the dead, five were highly trained counterterrorism police officers and one was a prison inmate, according to officials.

The riot broke out late on Tuesday in the prison, located in Depok and holding suspected members of the Islamic State of Iraq and the Levant (ISIL) group.

Al Jazeera's Step Vaessen, reporting from the site, on Wednesday, said the inmates want to meet their leader, Aman Abdurrahman, a self-proclaimed leader of ISIL in Indonesia who was detained and is currently put on trial for plotting an attack on the same prison.

Three ISIL suspects had been arrested four days before the riot by police, who said they were plotting to attack the police force's headquarters in Jakarta.

As clashes erupted between the inmates and the officers in the prison, some inmates managed to escape by breaking down doors and slipping out of their cellblock, according to the officials.

The escaped prisoners then took a number of officers hostage, five of whom have now been declared dead.

The prisoners stole guns, ammunition and weapons, the officials said, adding that some of the police officers remain in captivity.

A tense situation has last at the prison for over 18 hours now, with police officers seeking to arrest inmates involved in the riot on "terrorism" charges.

Negotiations to resolve the crisis have also been taking place between since Tuesday night, reports have said.
Prisoners at a detention centre for terrorists in Jakarta revolt, killing five officers and taking a sixth hostage. Negotiators accept a demand for an audience between the rioters and Aman Abdurrahman, an inmate who is the head of ISIL in the country.