MINNEAPOLIS (AP) — Prosecutors charged a Minneapolis police officer accused of pressing his knee against George Floyd’s neck with second-degree murder on Wednesday, and for the first time leveled charges against three other officers at the scene, according to criminal complaints.

The updated criminal complaint against Derek Chauvin says the officer’s actions were a “substantial causal factor” in Floyd’s death.

“Officer Chauvin’s restraint of Mr. Floyd in this manner for a prolonged period was a substantial causal factor in Mr. Floyd losing consciousness, constituting substantial bodily harm, and Mr. Floyd’s death as well,” the criminal complaint said.

The complaints against the other officers allege they aided and abetted in Chauvin’s actions.

Widely seen bystander video showing Floyd’s May 25 death has sparked protests nationwide and around the world against police brutality and discrimination. Chauvin was fired May 26 and initially charged with third-degree murder and second-degree manslaughter. The three other officers involved were also fired but were not immediately charged.

Minnesota Attorney General Keith Ellison updated the complaint against Chauvin to add a charge of unintentional second-degree murder, in addition to the earlier charges. He also charged Thomas Lane, J. Kueng and Tou Thao with aiding and abetting second-degree murder and second-degree manslaughter.

The unintentional second-degree murder charge alleges that Chauvin caused Floyd’s death without intent while committing another felony offense, namely third-degree assault. It carries a maximum penalty of 40 years in prison, compared with a maximum of 25 years for third-degree murder.

The other officers face the same maximum penalties for aiding and abetting, if convicted.

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