Ironman Chattanooga spots sold out three minutes after registration opened at noon today.

Andrew Messick, World Triathlon Corporation CEO, tweeted around 12:30 p.m. that all spots were filled up that quickly.

"Ironman Chattanooga just sold out. 3 minutes." his tweet said.

No details were available about how many spots were open at the time of registration.

Read more from our news partners at the Chattanooga Times Free Press.