A small brush fire that consumed about 50 square-feet of vegetation and a utility pole in Pasadena before being extinguished by firefighters on Friday is believed to have been intentionally set, authorities said Saturday.

The Pasadena case is the third arson or attempted arson reported in recent days — one happened Friday night in Anaheim and a second blaze was reported in Irwindale — as much of Southern California was shrouded under the smoke of multiple, massive wildfires.

The Pasadena fire was reported just after 1 p.m. near Arroyo Parkway and Glenarm Street, according to Pasadena Fire Department spokeswoman Lisa Derderian.

It grew to about 50 feet by 50 feet and destroyed a utility pole before Pasadena firefighters, with help from their counterparts from South Pasadena, extinguished the flames, officials said.

“Luckily, there were no winds,” Derderian said.

Investigators determined the blaze was arson, but the specific manner in which the fire ignited remained “under investigation pending further witness statements,” according to Derderian.

No injuries were reported.

Friday’s fire was the third brush fire that was declared arson in two days, as firefighters worked relentlessly to combat multiple major wildfires throughout the Southland that have blackened hundreds of square miles, destroyed hundreds of homes and other structures.

Anaheim residents helped police detain a man who authorities say was spotted trying to set fires near the Anaheim Hills Festival shopping center at 6 p.m. Friday, authorities said. No active fires were reported in the area at the time.

And police in Irwindale arrested a 33-year-old Azusa man Wednesday on suspicion of arson after he was seen fleeing from the origin point of a nearly 1-acre brush fire near Lario Park in Irwindale.

Authorities ask that anyone with information on the Pasadena fire to call 626-744-4241. Tips may also be submitted anonymously to L.A. Regional Crime Stoppers at 1-800-222-8477.