A bomb squad responded and police in Pleasant Hill shut down gas pumps at a local service station late Saturday after two people were found with an explosive device in their car.
Officers on the graveyard shift arrested two suspects after finding the device in a car at a Chevron station at 1705 Contra Costa Boulevard.
The Walnut Creek police bomb squad responded and rendered the device safe, according to Pleasant Hill police.
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"Making and possessing explosive devices is not safe," police said on social media. "It puts the fabricator and the entire community at risk."
Last week, Pleasant Hill police arrested a suspect for allegedly setting off illegal fireworks at an ARCO gas in the area of Pleasant Hill Road and Devon Avenue.
The explosion, about 11:15 p.m. on Dec. 28, caused moderate damage to a vehicle.
The suspect, whose name was not immediately released, was booked into jail on suspicion of multiple offenses, police said. No injuries were reported.