Buffalo safety Damar Hamlin “suffered a cardiac arrest” on the field during an NFL game against the Cincinnati Bengals on Monday night, the Bills announced via Twitter.

“Damar Hamlin suffered a cardiac arrest following a hit in our game versus the Bengals,” the NFL team announced. “His heartbeat was restored on the field, and he was transferred to the UC Medical Center for further testing and treatment. He is currently sedated and listed in critical condition.”

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· BUFFALO’S DAMAR HAMLIN GIVEN CPR AFTER COLLAPSE, MNF GAME POSTPONED

In the first quarter, Hamlin tackled Cincinnati Bengals wide receiver Tee Higgins, who had caught a pass. The Buffalo defensive back stood up after taken the brunt of a blow from Higgins, then collapsed.

Medical personnel attended to Hamlin on the turf at Paycor Stadium as his teammates and opponents reacted with shock and sadness to his situation.

Hamlin was placed in an ambulance on the field and taken to University of Cincinnati Medical Center, which is about 2 miles from the Bengals’ home field.

The players went to their locker rooms after Hamlin was transported, and the NFL announced the game had been postponed. The league did not announce when or if it might be resumed.

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Mark Inabinett is a sports reporter for Alabama Media Group. Follow him on Twitter at @AMarkG1.