An unidentified man allegedlyattempted suicide by jumping in front of an approaching train at Rabindra Sarobar metro station here on Sunday morning, a Metro official said.The man was admitted to a state-run hospital with injuries, a police officer said.He jumped in front of a Dumdum-bound metro rake at 10.35 am, the Metro official said.Metro services were hampered till 11.18 am due to the incident, he added.