Chennai: Security at actor Rajinikanths Poes Gardenresidence has been enhanced in the wake of protests announced bypro-Dravidar outfits demanding an apology from him for his remarksagainst Rationalist leader Periyar.Police sources said a three-tier security cover has been provided at his residence. Meanwhile, members of Periyar Dravida Kazhagam gathered near Semmozhi