(McKinney, TX) – A Saturday afternoon explosion at Texas-based Franconia Brewing injured two people.

Per WFAA, “The blast propelled a cylinder through a wall, injuring the two people. One was airlifted by helicopter ambulance to Parkland Memorial Hospital in Dallas for treatment; the other went by ground ambulance to Medical Center of Plano. Their names and conditions were not available.”

People at the scene said on Twitter that many people were at the brewery taking tours around the time of the accident and it is fortunate that more people weren’t injured from the explosion.

Soooo we are in the middle of the tour and one of the kettles at Franconia exploded http://t.co/H2UsiQdo we were in there 3mins before — ebalsumgo (@ebalsumgo) February 18, 2012

Taking a tour of the Franconia brewery in McKinney, TX this morning and there was a beer explosion. #franconiaexplosion pic.twitter.com/J2cMwRQY — Sean Koval (@SdotKoval) February 18, 2012

Mother of god. Disaster at Franconia Brewing. Fermenter exploded. We are lucky to be alive pic.twitter.com/tfMBFfnT — Connoissaurus (@Connoissaurus) February 18, 2012

According to reports, the source of the explosion is still under investigation. A similar blast at Otter Creek in November was caused by a failure in a pressure relief valve.