Security has been tightened in Tamil Nadu and Kerala following an intelligence alert that six Lashkar-e-Taiba (LeT) terrorists have entered the state through Sri Lanka, the police said on Friday. According to police, the group comprises one Pakistani national and five from Sri Lanka.

A red alert has been sounded in Coimbatore where the police suspect the terrorists might be holed up. The police are reportedly scanning the Coimbatore railway station with the help of sniffer dogs and also checking all departing trains.