Arson investigations have been launched after two suspicious fires were started in Preston, say firefighters.
Crews were called to the first fire at around 8:15pm on Thursday May 25 near to the Sainsburys on Flintoff Way.
A spokesman for the fire service said: "A delivery driver spotted a fire at the back of the Sainsburys and called 999.
"The fire was well-alight when we arrived.
"Children were spotted running away from a pile of garden waste that appeared to have been set on fire.
"We used hosereels to put the fire out.
"The fire was very close to some trees and because of the dry, warm weather, there was a potential for the fire to spread.
"But thankfully, we managed to extinguish the fire before this happened."
Nobody was injured during the incident.
Crews from Preston were called again around half an hour later at 8.50pm to Sharples Scrap Yard on London Road.
They were alerted via a 999 call to the site where a pile of logs had gone up in flames in what was thought to be another deliberate fire.
Hosereels were used to extinguish the blaze which had a potential of spreading to other material that was nearby, say fire services.
Nobody was injured.