The fourth person charged in the alleged mistaken-identity kidnapping and murder of grandfather Chris Baghsarian is also accused of arson.

Moustafa Ohrok, 19, did not apply for bail when he appeared in Sydney’s Mount Druitt Local Court on Wednesday, charged with the murder of the 85-year-old in February.

Ohrok was arrested on Tuesday.

Three others have already been charged and remain before the courts.

NSW Police Commissioner Mal Lanyon said Ohrok was involved in Baghsarian’s initial abduction on February 13

“We’re alleging this 19-year-old actually provided a firearm that was used in his initial kidnapping,” Lanyon told 2GB radio.

Investigations continued into other possible suspects, he said.

Ohrok faced two charges in court on Tuesday of damaging property by fire and participating in a criminal group.

He will next face Parramatta Local Court on the arson matter on May 21.

The 19-year-old will appear in Penrith Local Court on the murder and kidnap charges on June 12.

Police have said Baghsarian was not the kidnappers’ alleged target, and his abduction was a case of mistaken identity. In the days after, they made multiple public appeals, urging the kidnappers to release the 85-year-old and return him to his family.

But on February 24, Baghsarian’s body was found near a golf club in Pitt Town in Sydney’s north-west.

Police suspect the perpetrators aimed to abduct a relative of Sydney businessman Dimitri Stepanyan, who lived on the same street as Baghsarian, with the hope of receiving a $50 million ransom.

Investigators believe Baghsarian was killed on the night of February 14 at a makeshift stronghold in Dural, about a half-hour drive from where his remains were found.

A growing number of underworld attacks have permeated Sydney streets. Lanyon said the city faced a very different organised crime environment.

“We are seeing young people predominantly being contracted online to conduct very serious criminal activity,” he said.

“There are a lot of young people who are seeing what they believe to be an easy dollar but not understanding the ramifications … the crime of murder carries life.”

Meanwhile, a 15-year-old boy was among five people charged on Wednesday over a separate kidnapping in south-west Sydney.

The group are accused of beating up a bodyguard with a baseball bat and abducting him in his own car. He was freed by police an hour later.

-AAP