The police in Thiruvananthapuram have stepped up vigil at all important entry points to the city to prevent Vishwa Hindu Parishad leader Praveen Togadia's entry.
Togadia is scheduled to attend a meeting in Thiruvananthapuram later in the day.
"All entry points to the city are being closely monitored," police sources said.
The district collector issued a ban on Togadia's entry into the city on April 7 under section 144 CrPC.
In Coimbatore, Kerala police have posted a team at the airport.
Policemen in plain clothes have been posted at railway and bus stations too.