New charges will be brought in the murder of George Floyd, law enforcement sources told the Minneapolis Star Tribune Wednesday.

Derek Chauvin, the police officer videotaped pressing his knee into Floyd's neck, will have his charge of third-degree murder upgraded to second-degree murder. Under the updated charge, Chauvin could face up to 40 years in prison, up from 25 years,

The other three police officers involved in the incident will face charges of aiding and abetting murder.

Minnesota Senator Amy Klobuchar posted a tweet confirming the new charges, writing that the new legal action is "another important step for justice."

Prosecuting attorneys said that Chauvin had his knee on Floyd's neck for a total of 8 minutes and 46 seconds; 2 minutes and 53 seconds of these were after Floyd had already gone numb.

The murder of Floyd set off large-scale protests across the United States against police brutality and racism. Many protests have turned violent, with attacks on police and looting. Dozens of cities across the US, including New York City, have declared curfews in an effort to stem the violence.