Minnesota lawmakers are calling for a thorough investigation into the death of George Floyd, who died after being arrested by Minneapolis police.

Sen. Amy Klobuchar, Sen. Tina Smith, Rep. Ilhan Omar and Rep. Betty McCollum sent a joint letter to U.S. Attorney Erica MacDonald and Hennepin County Attorney Mike Freeman Tuesday night. The lawmakers are asking for investigations to be completed at the federal, state and local levels and for those involved in the incident to be held accountable.

According to Minneapolis police, Monday night, officers responded to 3700 block of Chicago Avenue South on a report of a forgery in progress. When they arrived, they found Floyd in a vehicle and when they ordered him to get out of the vehicle, he began to resist arrest. A video taken by a bystander showed Floyd on the ground and an officer pressing a knee into his neck. During this, Floyd repeatedly said he could not breathe before appears to lose consciousness. Floyd later died at Hennepin County Medical Center.

The case is under investigation by the FBI and Minnesota Bureau of Criminal Apprehension.

Minneapolis Police Chief Medaria Arradondo announced four Minneapolis police officers have been fired in connection to the incident.