He's accused of starting a series of fires that led to the evacuation of four businesses in Merced.
Officials say calls about four fires came in within a 30-minute span, starting around 4:45 Monday afternoon.
All of the fires were within two blocks in the area of G Street and Park Avenue.
One of the fires spread to the roof the "In Shape" gym building.
No one was injured in any of the fires.
A short time later, police found 44-year-old Allan Lopez, arrested him and booked him into the Merced County jail on multiple charges.