Security has been tightened across Tamil Nadu following intelligence inputs that members of the Lashkar-e-Taiba had infiltrated into the state, police said on Friday.
Coimbatore Police Commissioner Sumit Sharan said the city was under a high alert following information that the terrorists were heading there.
Officials said security had been beefed up in the state following reports that six members of the terror outfit LeT infiltrated into the state by sea from Sri Lanka and moved to different cities.
Security has been stepped up at many places, including airports, railway stations, bus stands and places of worship across the state. An alert has been sounded especially in coastal districts to prevent any further possible intrusion, the police said.
Chennai Police Commissioner A K Viswanathan said "storming operations" were underway as part of precautionary steps.
Sharan said 10 numbers quick response teams habve been put at strategic places just in case to respond if there is any requirement.
"We have put arrangements at all the shopping malls, important temples and all important installations. We have also informed the Army and the Air Force to alert their defences," he told reporters.
The city and its surroundings have come under a tight security cover, with over 2,000 police personnel being deployed, and vehicle check and such checking points enhanced, the police commissioner said. "As of a now, a general red alert is maintained."
When pointed out that the developments come close on the heels of the National Investigation Agency (NIA) action in the city, he said: "There is no need for panic, for worry. What the NIA did was a separate operation (and) this is a separate issue."