Jaipur, Jan 23 (Agencies): After being hit by an overbridge, three youths travelling atop a train were killed and four others critically injured in Ajmer, Rajasthan on Sunday.

The accident took place in the wee hours when a large number of youths were going in trains to different districts for the police constable recruitment examination scheduled for the day.

"The incident came to light when passengers in a coach found blood trickling down in their coach when the train halted at Nareerabad railway station. They informed the railway authorities following which GRP staff found the bodies of two youths and five others in critically injured state," the GRP sources said.

"Students said that a boy who was standing on the moving train was hit by an overbridge a few minutes after the train left Ajmer junction. Few others also stood up to see him crying and they also got a hit by the bridge and fell unconscious. However, none fell down from the train," they said.

According to the GRP, the bridge is around 1 km away from Ajmer junction.

The deceased, all aged 19 years and identified as Heeralal Meena and Mukesh Kumar Meena from Jaipur and Hansraj Gujjar of Dausa, were going to Pratapgarh and Chittorgarh districts for the examination.

The injured candidates, identified as Trilok, Rinku, Satyapal Singh and Kheli Ram, were hospitalised in JLN hospital in Ajmer where their condition was stated to be serious, the sources said.

They said the train was overcrowded and many students who had climbed on top of the train were pulled down from it, but when the train started moving, several students climbed atop the train again.