Gunfire broke out during protests in Ferguson on the second anniversary of Michael Brown's fatal police shooting.

Protesters were seen cowering behind cars as shots were fired at the demonstration in Missouri to mark two years since the unarmed black teen was shot dead by police.

A man, named locally as Jacoby Thomas, was also injured in a hit-and-run after a car sped through a group of protesters who were blocking a street.

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Gunfire broke out during protests in Ferguson on the second anniversary of Michael Brown's fatal police shooting

Protesters were seen cowering behind cars as shots were fired at the demonstration in Missouri to mark two years since the unarmed black teen was shot dead by police

A man hit by a car during protests in Ferguson on the second anniversary of Michael Brown's fatal police shooting is carried to a waiting vehicle to be driven to hospital

Demonstrations were held to mark the anniversary that Michael Brown was shot dead by police

Witnesses say the vehicle hit the young man so hard that he flew into the air. He was rushed to hospital where his condition is unknown.

'A lady came down and hit a protester - knocked the shoes off his feet,' said Sharon Cowan, who was at the scene. 'Hit him, and he rolled and he bounced.'

Heather De Mian, who was at the protests, said she screamed when the man was hit.

The car sped off without stopping after hitting the protester, according to witnesses.

Moments later, shots rang out at the demonstrations.

'Then when the bullets flew, I started screaming some more,' she said.

Police responded to reports of gunfire but had found no evidence that anyone had been struck, said Ferguson spokesman Jeff Small, who declined to speculate about why the shots were fired.

He also added that he believed the driver didn't intentionally strike the protester, adding: ' By all accounts, her version of what happened seems to fit the version of what happened to a person driving down a busy West Florissant Avenue and not seeing a person standing there.'

Police responded to reports of gunfire but had found no evidence that anyone had been struck

A man, named locally as Jacoby Thomas, was also injured in a hit-and-run after a car sped through a group of protesters who were blocking a street

Witnesses say the vehicle hit the young man so hard that he flew into the air. He was rushed to hospital where is condition is unknown

A protest was held on the anniversary of the shooting death of Mike Brown Jr. by Ferguson police

Citizen journalist Chuck Modi, who was at the scene, described the protests as an 'insane night' and claimed that a man in a wheelchair was tased during the confrontation.

By around 10pm, the protesters had disbanded.

Earlier in the day, hundreds had gathered for a memorial service and moment of silence.

The crowd gathered at the spot on Canfield Drive where the black, unarmed 18-year-old was shot by Ferguson officer Darren Wilson on August 9, 2014, after a confrontation.

The shooting led to months of protests not only in Ferguson, but around the country.

The teen's father, Michael Brown Sr., said in a brief speech that the anniversary is a sad day for him and his family, but for the world, too.

'My son built families up, opened the eyes of the world and let them know this ain't right,' he said.

'This color is not a disease. This color is beautiful. Black is beautiful.'

Anniversary: A couple hundred (above) people marked the two-year anniversary of Michael Brown's fatal shooting by a police officer in Ferguson, attending Tuesday's memorial service

Michael Brown, Sr. holds his daughter Mikelle Brown, 3, as he addresses the crowd during a memorial ceremony for his son on Canfield Drive on Tuesday

On Saturday, Walk for Justice was held in Brown's memory as participants walked along on Lucas and Hunt Roads in the city to where he is buried at St. Peter's Cemetery in Normandy.

Photos from the event show attendees uniting and reaching out their hands in support of the teen's father as they stood in front of the cemetery.

Another powerful photo from Saturday's walk showed Lezley McSpadden, mother of Michael Brown, joining other mothers of people killed by police officers, including Gwen Carr, the mother of Eric Garner.

Mama Fatou, 66, who brought her grandson and two other young children to the memorial service on Tuesday, and said she still feels sad, especially for Brown's parents.

'It hurts to see a mother lose her child,' Fatou said. 'Her pain is our pain.'

Brandy Shields, 19, went to school with Brown and remembered him as a kid who 'never got into trouble'. Shields comforted a little girl who was crying at the service.

Michael Brown, Sr. said: 'My son built families up, opened the eyes of the world and let them know this ain't right.'

Supporters reach out their hands on Saturday in support of Michael Brown, Sr., wife Cal (center left) and daughter Mikelle as they stand in front of the cemetery where the teen is buried

'It'll get better,' Shields told the child. 'We have to make it better, but it'll get better.'

A state grand jury declined to press charges against Wilson, and the U.S. Justice Department later cleared him, concluding that he had acted in self-defense. He resigned in November 2014.

Brown's death also was a catalyst for the Black Lives Matter movement, which rebukes police treatment of minorities and has grown following several other killings of black men and boys by police, such as Tamir Rice in Cleveland and Philando Castile in Minnesota.

More than 60 organizations affiliated with the movement released this month a list of six demands and 40 recommendations for how to achieve policing and criminal justice reforms.

The 2014 shooting also led to a Justice Department investigation that found patterns of racial bias in Ferguson's police and municipal court system.

The federal agency and the city agreed this year to make sweeping changes.

Emotional: Lezley McSpadden, mother of Michael Brown, joins other mothers of people killed by police officers, including Gwen Carr (right), mother of Eric Garner, at the memorial site where Michael Brown was killed

The 2014 shooting also led to a Justice Department investigation that found patterns of racial bias in Ferguson's police and municipal court system. Above his gravestone is pictured

Most recently, around 25 protesters, holding signs that read 'Black lives matter' and 'Disarm the police', gathered in Salt Lake City to protest against the fatal shooting of a teenager in Utah.

Somali refugee Abdullahi 'Abdi' Mohamed, 17, was shot four times by police who were responding to an alleged assault outside a downtown homeless shelter on February 27.

He was critically injured but survived the shooting.

On Monday, Salt Lake County District Attorney Sim Gill had said that police were justified in shooting the teen because police believed he was about to harm a man with a metal broom handle.

But the ruling sparked protests in Utah on Tuesday night.

Members of the group Utah Against Police Brutality and other local activists called for a Utah prosecutor to resign after he cleared the two cops involved.

Protester Carly Haldeman said officials are not being transparent with the public by refusing to release body camera footage from the February 27 shooting.