"A murderer lives here" has been scrawled outside the home of a white now-former police officer who used his knee to pin down George Floyd.
Red paint appeared to have been splattered on the floor during a protest in front of Derek Chauvin's house in suburban Minneapolis-St Paul in the US.
Demonstrators wrote messages in chalk and held signs with messages such as "I can't breathe", "Black lives matter" and "Evil hides behind the badge".
After nightfall, a line of riot police stood guard outside Derek Chauvin's home as dozens of protesters gathered and footage showed at least one person being chased and detained.
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It came as the second night of protests descended into violence with riots, a man being shot dead as shops were looted and buildings being torched in the Midwest city as Mayor Jacob Frey appealed for calm.
No one has been charged with the death of Mr Floyd, 46.
Footage captured by a witness shows Mr Floyd lying face down, gasping for air and groaning, and repeatedly saying, "please, I can't breathe," before growing motionless as he was detained by four officers on Monday night.
Mr Floyd was unarmed and had been accused of trying to pass counterfeit bills at a corner eatery when he was confronted by police.
He was taken by ambulance from the scene and pronounced dead in hospital later the same night.
On Wednesday, protesters gathered outside the home of former officer Chauvin, 44, who put his knee on the neck of handcuffed Mr Floyd, a black man, for about eight minutes while pinning him down in the street.
"Murderer" and "A murderer lives here" was written in chalk on the driveway, along with messages such as "F*** you" and "Rest in power".
People also drew hearts with "George Floyd" written inside them.
The road was eventually closed and additional officers arrived to prevent access to the home.
At night, armed police stood guard outside the house as demonstrators waved signs and chanted.
One person, who appeared to be shining a torch in the eyes of the baton-wielding officers, clad in riot gear including helmets and plastic face shields, was chased down and detained.
The officers then approached the crowd of demonstrators as people screamed "F*** the police" and called the officers "pigs".
It came as social media users shared Chauvin's address and screen grabs of the outside of his house.
Some Twitter users were sharing the wrong address and screen grabs of the wrong house.
Wednesday night's protests came after Mr Frey urged prosecutors "to charge the arresting officer in this case".
The policeman shown kneeling on Floyd's neck and three fellow officers involved were dismissed from the police department on Tuesday as the FBI opened an investigation.
The city identified the four officers as Derek Chauvin, Thomas Lane, Tou Thao and J Alexander Kueng.
The local police union said the officers were cooperating with investigators and cautioned against a "rush to judgment".
The county attorney's office said it would decide how to proceed once investigators had concluded their inquiries.
Mr Floyd was unresponsive and without a pulse by the time he was en route to hospital, and first responders and A&E staff worked for nearly an hour to keep him alive, the Star Tribune reported.
He was pronounced dead 90 minutes after the initial encounter with police.
He was still handcuffed when he was loaded into an ambulance. A first responder freed his hands once he was inside.
Hennepin Healthcare EMS Chief Marty Scheerer told the newspaper: “He still had an outside chance. Even if it’s a super long shot, you've got to try your best.”
Medics arrived six minutes after the distress call.
Mr Scheerer said first responders did everything right after being called to the scene, adding that the paramedics were likely unaware that Mr Floyd had been pinned down for so long.
He added: “I don’t think the paramedics knew what was going on. They just saw a split second of what was happening.
"Ultimately, if the police have somebody in custody, we have to get permission from them to work with on the patient.”
The case was reminiscent of the 2014 killing of Eric Garner, an unarmed black man in New York City who died after being put in a banned police chokehold.
Mr Garner's dying words, "I can't breathe," became a rallying cry for the Black Lives Matter movement calling attention to a wave of killings of African-Americans by police using unjustified lethal force.
