A high-alert has been sounded in Mumbai for Sunday following intelligence inputs that subversive elements may strike in the city, police said today.The entire police and para-military setup in Mumbai has been put on guard, particularly since subversive elements could take advantage of the relaxed weekend life of the city to strike, they said.Mumbai Police Commissioner A N Roy told PTI that inputs had warned police to be on guard between August 15 to 20. "Tomorrow being the last day of the warning, we are being extra cautious," he said.Roy said vital installations, prominent places and places of importance are under heavy security since Independence Day, and will continue to remain so at least for a few days ahead.Informed sources said that intelligence agencies had tipped Mumbai police that some "leftover" groups of terrorist outfits were still roaming in the country and Mumbai could still be their target for subversive activities.Security has therefore being tightened at railway stations, bus terminuses, entry points, vital installations, religious places and communally sensitive areas, sources added. PTI