Damar Hamlin attends his first game to support the Buffalo Bills against the Cincinnati Bengals following his cardiac arrest

• Damar Hamlin is attending Sunday's game between the Buffalo Bills and the Cincinnati Bengals.
• Videos posted to social media show Hamlin arriving at the Bills' locker room.

Damar Hamlin is attending his first Buffalo Bills game since his on-field cardiac arrest three weeks ago.

In a video posted to the Bills' official Twitter and Instagram, 24-year-old Hamlin is seen arriving at the team's locker room.

During the game, the Bills' Twitter account shared another video showing Hamlin and his family watching the game from the skybox.

"Happy to have the Hamlin family here today," the tweet read.

Another video, posted to Hamlin's own Twitter on Sunday, shows him in uniform, striding on and off the field and greeting people on the sidelines. It's unclear if the video is from today's game, but fans in the comments voiced their excitement.

Sunday's game at Highmark Stadium in New York is the Buffalo Bills' AFC divisional round playoff game against the Cincinnati Bengals. The two teams were playing on January 2, when Hamlin collapsed and went into cardiac arrest.

As Insider previously reported, Hamlin was discharged from the University of Cincinnati Medical Center just one week after his cardiac arrest. Hamlin "was dead" when he collapsed, Dr. Timothy A. Pritts, chief of the section of general surgery at the University of Cincinnati Medical Center, told The New York Times.

According to the Associated Press, the team has not disclosed the results of tests Hamlin underwent to determine why his heart stopped.