The incidents took place around the corner from one another and minutes apart.
Officers on routine patrol were nearby when a Chevrolet pickup truck exploded around 1:30 a.m. on the 900 block of Bristol Street.
Firefighters were called to extinguish the flames when they were told another vehicle was on fire.
They discovered a Ford truck with the interior on fire on I Street and crews quickly doused the flames.
No one was injured in either vehicle.
The Fire Marshal and police have determined the incident was done by an arsonist.