****UPDATE: Senator Tillis posted a video to Twitter on Wednesday morning saying, “I’m fine,” and that he “got overheated.” He added there was “no CPR, no special measures, just checking me out [at the hospital].”****

Republican Sen. Thom Tillis of North Carolina collapsed during a Washington, D.C., race Wednesday morning and has been taken away by ambulance.

Tillis, 57, was seen on the ground being administered CPR by bystanders at about the two-mile mark in the three-mile race in Anacostia Park in the southeast part of the city.

Tillis at first appeared unconscious but was revived and breathing when taken away by ambulance from the ACLI Capital Challenge 3 Mile Team Race.

Debra Alfarone is a reporter for the CBS affiliate television station in Washington, D.C., and tweeted a picture of Tillis being loaded into an ambulance.

Alfarone added in a subsequent tweet that Tillis “stopped breathing and 3 runners saved him.”

Information from The Associated Press was used in this report