Source: pwinsider.com
It happened during the Eric Young vs Johnny Devine match
"Suddenly, the whole ring filled with smoke. It turns out, some pyro apparently caused a fire above the ring and there were two fire extinguishers being used to put it out up on the catwalks. The place was filled with the white smoke from the extinguishers. It was like watching wrestling in a fog."
After the match,
"Back live, they were still cleaning up from the fire extinguisher residue, and they replaced the ring mat. Don West & Mike Tenay gave credit to the fans for not letting the conditions dampen their enthusiasm or energy. West & Tenay then stretched for a while, discussing the tag match, then they went to a series of video packages on Sting.
Our own
Joe Mistretta, live at the building, has informed us that the Fire Department is evacuating the building and have asked all fans to leave. Obviously, this is due to the earlier fire above the ring.
On the PPV broadcast, they temporarily put up a "Technical Difficulties, Please Stand By" graphic, followed by more video packages.
Back live, we were outside with Mike Tenay & Jeremy Borash standing next to a fire truck. They explained that the building had been evacuated by the Fire Department, and that once they were allowed to return to the ring, the show would continue. They showed footage of the fire in the rafters, and the fire extinguishers putting it out. Don West joined them, and announced that the fans were being allowed back into the building.
We saw a lot of shots of firefighters, as West and Tenay stretched for time. Tenay and West put over how well the fans behaved throughout all the problems.
They showed a shot of the now-empty arena, and mentioned how fans were being allowed back in now. West pointed out that while some changes in the card would take place, he stressed that the title bouts and the Falls Count Anywhere match will take place tonight."
Because of the fire, they had to cancel the 4 way tag match.