Security across Kerala has been tightened in view of the twin-blasts on board the Bangalore-Guwahati Express at Chennai Central station today, police said.
Police conducted searches at major railway stations and bus terminals in the state.
State Home Minister Ramesh Chennithala said there was no need to panic and instructions have been given to tighten security.
A woman was killed and 14 others were injured in the blasts in two coaches when the train arrived at the station.