The man who filmed Freddie Gray's arrest was filmed weeping as he heard the news that six officers are charged with illegally detaining and killing his 25-year-old friend.

Kevin Moore, 30, was himself arrested on Thursday, and claims he has been subjected to police harassment since handing over the footage.

On Friday, after the State's Attorney Michelle Mosby announced her decision to file criminal charges against the cops, Moore was overcome with emotion.

'I'm exuberant. I'm happy. I'm every positive word you can think of. I finally made a difference in the world,' he told the Baltimore Sun.

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As State's Attorney Michelle Mosby announced charges against the cops, Moore was overcome with emotion

'I'm exuberant. I'm happy. I'm every positive word you can think of. I finally made a difference in the world'

'We're going to keep on marching for human rights. We're going to keep on going until this stops - the police brutality.'

Gray, 25, was hauled into a paddy wagon at 8.40am on April 12 before police even had a reason to arrest him, Mosby told a press conference.

She said they later found a legal knife in his pocket, and claimed he was in the unlawful possession of a switchblade.

Slamming the officers for the way they lay the 25-year-old on his stomach without a seat belt in the van, Mosby vowed to seek justice for the Gray family.

Her words were met with elation across the country.

Moore was celebrating, hours after being released from custody. He was detained with two members of Cop Watch, a group that documents police work in communities across America.

'Arrested': Kevin Moore, 30, was allegedly detained at gunpoint on Thursday after 'days of harassment' from Baltimore police. He filmed the moment Freddie Gray, 25, was arrested on April 12, before his fatal injury

Contentious: Freddie Gray died a week after his arrest on April 12 (Moore's footage pictured). He suffered a 'catastrophic' injury at some point during or after his arrest and died a week later in hospital

He has since been released without charge but the other two men have not, according to CopWatch's Twitter page. It is not clear whether they face any charges.

His arrest came after days of alleged intimidation from police officers for filming Gray, who suffered a catastrophic spinal injury while in police custody and passed away a week later on April 19.

Earlier this week, Moore hit out at police for issuing his photo and saying he was 'wanted for questioning'.

According to Moore, he had already spoken with officers and handed over his footage of Gray's arrest. He believes cops released the image to intimidate him.

'What is so important that you have to plaster my picture over the Internet? I've already spoken,' Moore told the Baltimore Sun.

'For the police to post that picture and say you don't know who I am, that's B.S. You know who I am.'

Tensions are high surrounding the circumstances of Gray's arrest and death.

An investigation has concluded Freddie Gray broke his neck after falling head-first into the back of the police van as it was moving, it was reported today.

Dispute: Moore, 30, claims police released this picture knowing it was him, despite the fact he had already been interviewed in connection with Gray's arrest. He branded the tweet 'harassment'

Medical and law enforcement sources briefed on the police investigation told ABC News Gray's 'catastrophic' head injuries were consistent with hitting a bolt 'in the back door of the van'.

They claimed there was 'no evidence' Gray sustained a fatal spine injury during his arrest, which was caught on camera on a street side on April 12.

According to ABC's sources, Gray was standing in the van, bent over with his hand cuffed behind his back and his head pointing towards the back door.

It is believed he fell into the door, breaking his neck.

The news was revealed on Thursday afternoon, hours after Baltimore Police admitted the van transporting Gray made a previously unreported stop.

The mysterious detail was picked up by a privately-owned security camera, and will be integral to the police investigation into Gray's death, which was completed and handed to the state prosecutor on Thursday morning.

It is not known why the van stopped at the corner of North Fremont Ave and Mosher Street before it made another two stops then finally transported Gray to the hospital.

And police have yet to clarify why Gray would have been standing without a seat belt on. Just nine days before his arrest, the Baltimore Police Department issued a new policy, making it obligatory to belt all inmates placed in the back of a transport van.

Revelation: Police Commissioner Anthony Batts revealed a private security camera captured the van making an unknown stop. He refused to elaborate on the details of the new information

Police Commissioner Anthony Batts refused to elaborate on the new information.

He said the contents of the report, which was completed and handed to the State Attorney at 8.50am Thursday, will remain confidential as they continue to investigate.

Six officers have been suspended with pay over the incident, and the department has admitted Gray - who was asthmatic - should have been given the medical help he requested.

The report that Gray fell inside the van corroborates claims he was given a 'rough ride' by the van driver, who is the only officer yet to deliver a statement to the investigators, according to ABC.

The van in which Gray was injured is a Chevrolet Express - the same model of vehicle which has been modified into the 'Scooby' van driven by Hillary Clinton.