The Centre today sounded a terror alert for Mumbai and Ahmedabad following specific Intelligence inputs that Pakistan-based Lashkar-e-Taiba teams may have entered the two western cities to carry out strikes.Security forces launched house-to-house searches in some specific areas in Mumbai while additional forces were deployed in all sensitive and crowded places, including markets, religious places, bus and railway stations in the two cities. The police forces of the two cities have been put on high alert and specific instructions issued for taking all possible steps to foil any attempt by LeT terrorists to disturb peace, official sources said in New Delhi.