The O.C. Fire Authority is investigating a fire that took place on Jan. 4, at a parking structure in Downtown Santa Ana, at 5th and Broadway, at about 4 p.m., according to the OCFA.

A witness that was sitting in his car across from the parking structure heard an explosion and then saw two vehicles on fire. There was a big emergency response team on site including the SAPD, the OC Sheriff and the OCFA. An ambulance showed up as well but left the scene.

There were no reports of injuries to persons,but the two vehicles and the parking structure were damaged, according to local community activist Igmar Rodas, who posted a video on Facebook.