Shepard Smith reported on an explosion at a hotel in San Diego. Authorities say a drug lab was set up inside the hotel room, and a man on fire came running out.

Below is more from The Associated Press:

"Three people were injured Wednesday in an explosion at a hotel near SeaWorld San Diego and investigators were trying to determine whether there was a drug lab inside, authorities said.

A fire was reported at the three-story Heritage Inn Sea World Hotel shortly before 11:15 a.m. Several people called 911 and said there was an explosion at the hotel

and people were running outside, screaming, police said.

Flames spread from the second floor but the blaze was mostly under control within minutes.

Three people were taken to a hospital to be treated for burns and one was in serious condition, said San Diego Fire-Rescue Department spokesman Maurice Luque.

The cause of the explosion was unclear, but U-T San Diego reported that a drug task force, along with hazardous material crews, responded to the scene because there may be a possible drug lab inside the hotel."