(Left) Alfredo Reyes, 25, and Javier Chavez, 38, were arrested Wednesday for their alleged roles in an inmate assault that left one inmate in critical condition.

Two Arizona prison guards from Tucson have been arrested for their alleged roles in an inmate assault.

Corrections officers Javier Chavez and Alfredo Reyes were booked into the Pima County jail on several charges, including conspiracy to commit a dangerous or deadly assault, the Arizona Department of Corrections said in a news release Thursday.

Both were taken into custody when they arrived to work Wednesday at the state prison in Tucson.

They have since resigned. It's not known if they have attorneys.

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Investigators say video surveillance and other evidence indicates the pair didn't summon medical assistance for more than an hour after the assault occurred in the Cimarron Unit. They instead directed inmates to clean up the scene.

The inmate who was assaulted remained hospitalized Thursday in critical condition.

Several inmates are suspected in the assault and the effort to remove evidence.