Detectives have identified their prime suspect as 52-year-old Parviz Alemansoor.
San Bernardino police say Alemansoor poses as a service technician for a local fire extinguisher service company and steals fire extinguishers.
Nearly a dozen thefts have been reported in multiple commercial businesses in San Bernardino and Riverside counties from May 2012 until now.
Alemansoor was seen driving a 1999 Blue Ford Taurus with California license plate 5EISO75.
Anyone with information on the thefts or Alemansoor was asked to contact Sergeant Travis Walker or Detective Devin Peck at (909) 348-5615.