A series of fires broke out in the valley Saturday.
PFD: 4th fire to break out within 2 hours:
Crews responded to a house fire near 21st Street and Southern in the morning where two children were inside. They were able to get out safely and firefighters put out the flames, but the home sustained damage and appears to be a serious loss.
The Phoenix Fire Department has a warning for you about turning on a heater for the start of the winter season.
"First of all, we always want to make sure people get their units checked..smoke detectors can make a difference in saving lives," said PFD's Larry Nunez.
Investigators are still trying to figure out what caused the blaze.
Green Earth mulch fire:
At the Green Earth company in Phoenix, fire engulfed a giant mulch pile right off of Interstate 17 and Filmore.
Crews were able to put the fire out before it spread to other areas.
The cause of the fire is still under investigation.
Vacant home burns
At a home in Guadalupe, a fire burned a home near Montezuma and Southern Avenue.
The first alarm fire was first reported as a person trapped inside, but that turned out not to be the case. According to authorities, neighbors reported seeing vagrants flee from the house.
The Guadalupe Fire Department is concerned about the cold weather and people finding shelter in abandoned homes and using fire carelessly.
"As things cool down and people seek shelter in abandoned homes..it's always a concern any time of year that people start using artificial heat..to keep themselves warm or to cook with."
Crews were able to put out the flames and no one was reported injured during the fire.