At approximately 9:00 p.m. Tuesday night, Tustin PD was involved in a shooting in the 1800 block of Chestnut. A male suspect was barricaded in a Dodge Charger from approximately 7:00 p.m., and used a handgun to open fire on Tustin police. Officers returned fire, striking the suspect multiple times. The suspect was transported in grave condition to a local hospital. Tustin PD will be handling the investigation.