Tourist centres have been closed in many districts, including Kottayam and Thiruvananthapuram, and a night travel ban has been imposed in the hilly areas of Idukki district.
The Kerala High Court on Wednesday issued notice to India cricket captain Virat Kohli and the state government in a plea seeking ban on online gambling in the state.
Discounting any terror link, the Kerala police on Sunday took a man into custody for allegedly planting crude explosive material in the cargo-hold of a Kingfisher aircraft here last week in order to implicate security personnel.