The second day of Google's I/O conference was brought to a halt just before 4 p.m. on Thursday afternoon when a fire broke out at a Shoreline Amphitheatre concession stand.
By the time the fire was extinguished, a total of six people had reportedly suffered injures. Three of the injured were taken to the hospital for treatment, and one of the victims had life-threatening injuries, said Lynn Brown, Mountain View Fire Department spokesman.
The other three who were injured declined treatment at the scene, Brown said. He could not immediately elaborate on the nature of the injuries.
Google officials on Thursday evening announced they were in contact with the injured victims, who they identified as event staff.
"We're thankful to the fire department for putting it out and ensuring everyone's safety," wrote Google spokesman Joshua Cruz in an email. "We're making sure (the injured parties) receive the proper treatment."
Social media posts taken by attendees show the fire blazing in the back of a kitchen. But fire officials say it is unclear exactly how the fire started, and investigators are just beginning to determine what happened.
Held since 2008, Google I/O is the tech giant's main developer conference, drawing thousands of attendees each year.