A fire ignited inside the cab of a tanker truck late Sunday night and the cause is considered suspicious.
The fire was reported just before midnight at the Sun Coast Trucking Company on Interstate 10 East at Foster Road.
San Antonio fire officials said it appeared someone set the cab on fire and may have also punched holes in a tanker.
The tanker did not catch fire and crews put out the fire quickly.
No injuries were reported and damage estimates were not released. The arson unit is investigating the cause of the fire.