Listen to the mayday call here.

PORTLAND, Ore. -- Audio of the original mayday call from firefighters was released, giving some insight into the immediate aftermath of Wednesday morning's natural gas explosion in Northwest Portland.

At least eight people -- three firefighters, two police officers and three civilians -- were injured in the explosion. None of the injuries to the firefighters is life-threatening, with the most significant injury being a broken leg that required surgery.

The explosion happened at 9:39 a.m. on Wednesday morning at Northwest 23rd Avenue and Glisan Street.

BACKGROUND: At least 8 people injured in Portland gas explosion

VIDEOS: Scenes from explosion in NW Portland

PHOTOS: Gas explosion in NW Portland

COMMUNITY REPORTS: After explosion, businesses on NW 23rd check in

Listen to the mayday call here.