Three persons were injured in an explosion in an intercity train in Assam's Udalguri district on Saturday night, railway and police sources said.
The explosion occurred in a coach of the Kamakhya-Dekargaon Intercity Express at the Harisinga railway station around 7.04 pm, a Northeast Frontier Railway spokesperson said.
There persons were injured, one of them critically, and rushed to a hospital. Railway and police officials have rushed to the site -- around 95 km from Guwahati, the sources said.
Investigations are on and it was yet to be ascertained whether the explosion was caused by a grenade or an improvised explosive device (IED), the sources added.
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