A roof collapsed at another arena in central Alberta on Friday, this time in Drayton Valley.

A portion of the curling rink roof at the Omniplex collapsed around 1 p.m. 

“It is a fairly significant collapse," said Fire Chief Tom Thomson. "Approximately a third of the roof has collapsed.”

Snow on roof

There was snow on the roof at the time of the collapse. (Gary Moore/CBC News)

A water and gas leak was shut down, There were about 12 to 20 people inside at the time but everyone was able to get out safely.  

“We were fortunate that this incident occurred at a quiet time when the facility is open," Thomson said.  "Had it been later on in the day, it could have been more serious.”

About 18 inches of snow could be seen on the roof of the building. But at this point, it isn’t clear what caused the collapse, Mayor Glenn McLean said.

"We'll see what the appraisers report indicates, we'll see what the engineers tell us in terms of how to deal with this and how to avoid such a situation in the future."

All events scheduled for the Omniplex and the MacKenzie Conference Centre have been suspended for the weekend, including a curling bonspiel.

Town officials hope that some parts of the complex can reopen by Monday but the structural engineers have to make that call. It's believed that the section housing the curling rink was constructed in the early 1990s.

The Omniplex has two ice surfaces for hockey, a six-sheet curling rink and a conference centre. It is well-used, particularly in the winter, McLean said.

"When there's a closure, that's a significant event."

On Monday, part of the arena in Sylvan Lake collapsed. No one was hurt in that incident.