Shanliurfa Police Chief Eyup Pınarbashı said five suspects had been detained following the seizure of the car, Today's Zaman reported.
The incident comes one day after a bomb detonated by remote control rocked an area near a Turkish police checkpoint in the town and wounded three people.
Sources said that explosives were placed under a car and detonated near the town of Suruc, some 15 kilometers (9 miles) north of the Syrian town of Kobani, where Kurdish fighters recently forced out IS militants after a four-month siege.