The mishap occured as the driver of the jeep lost control over the vehicle and rammed into a tea stall injuring 11 persons, four of them seriously, Bahadurganj police station's Station House Officer (SHO) Chitranjan Thakur said.
The injured were admitted to a hospital where the attending doctors referred the four seriously injured to Kishanganj Medical College for treatment, sources said.
The driver has been arrested and the vehicle impounded, Thakur said.