The body of Turkish prosecutor Mehmet Selim Kiraz was laid to rest in Istanbul on Wednesday. The funeral drew a large crowd in Turkey's largest city.

On Wednesday, police detained at least 19 members of the group, the BBC reported.

Kiraz, who was taken hostage at gunpoint by members of the Marxist revolutionary group DHKP-C earlier on Tuesday, was killed in a shootout between police and the gunmen.

#BREAKING Hospital officials:We have lost Prosecutor Kiraz at 21:55. He was deceased by the time he had arrived.

Update — 4:15 p.m. ET: Prosecutor Mehmet Selim Kiraz died due to injuries sustained while he was taken hostage at gunpoint on Tuesday.

The prosecutor was severely wounded when security forces launched a rescue operation after hearing gunshots from the room where he was being held hostage by two masked gunmen.

Mehmet Selim Kiraz, a Turkish prosecutor in charge of the case of murdered teenager Berkin Elvan, was taken hostage at gunpoint on Tuesday, according to local media reports

Special forces agents made their way into the courthouse where the prosecutor is being held hostage, Reuters reported:

The Revolutionary People's Liberation Party-Front (DHKP-C) published a picture of the prosecutor with a gun to his head. The prosecutor is leading an investigation into the death last year of a teenager wounded during anti-government protests.

DHKP-C is a leftist terrorist group that was active in the 1980s and 1990s but has been dormant until the last several years. It took responsibility for bombing the U.S. embassy in Ankara in 2013.

The group plays a part in the protests against police that are ongoing in some poor neighborhoods that are DHKP-C strongholds in Istanbul.

Berkan Elvan, 15, was killed in March last year while walking home through a protest. He was critically injured after being hit by a police officer's tear-gas canister. Elvan, who was from a DHKP-C neighborhood, died after 269 days in a coma.

he negotiations between the DHKP-C protestors, who took the Istanbul Republic Prosecutor Mehmet Selim Kiraz hostage in his room in the Caglayan Courthouse's 6th floor, and the police are ongoing.

According to local media reports, three hostage takers entered Kiraz's room and took him hostage after making his secretary leave. They put signs and posters of Elvan in Kiraz's room and circulated the photo of the prosecutor with a gun to his head on social media.