Growing civil unrest, riots and protests are raising the possibility of a second wave of the coronavirus outbreak, city and state officials warned, as the violence and public gatherings intensified into Sunday morning.

Thousands have gathered across multiple states to demonstrate following the death of George Floyd, who died after a police officer put his knee on his neck while arresting him in Minneapolis.

According to an Associated Press tally, nearly 1,400 arrests have been made across the nation during the demonstrations, amid concerns some are attending the protests not to demonstrate but as a springboard for violent actions. Clashes have broken out with police using tear gas and rubber bullets against the crowds.