Officers arrested the pair Thursday at about 7:30 p.m. near the Westfield North County Mall and were being questioned by arson investigators, Escondido police Chief Craig Carter said.
A witness called police after spotting two people set a fire near South EscondidoBoulevard at 6:30 p.m. About an hour later, another person called to say he was chasing two people he saw trying to start a fire in Kit Carson Park near Interstate 15 and Bear Valley Parkway, according to Escondido police.
Both fires were put out before they spread.
Police arrested 19-year-old Isaiah Silva of Escondido and a 17-year-old.
Authorities said they do not believe the suspects were involved in an of the wildfires burning throughout San Diego County.