More police were deployed to city streets, including in India's financial capital, Mumbai, which was attacked in 2008. Airports and railway stations and the popular beach resort state of Goa all tightened security following intelligence reports that the banned militant group, Lashkar-e-Taiba was planning to target these places, an official with the Home Ministry said. He spoke on condition of anonymity as he was not authorized to speak to the media.
India has taken even minor terror threats seriously since a three-day terrorist siege killed 166 people in Mumbai, though there has been no major attack there since.
Security has been high in Mumbai since Friday, when police began searching for four men who authorities believe entered the city to carry out a terrorist attack. Computer-aided photographs of the four suspects were released.
On Tuesday, police made house-to-house searches in some parts of the city and tightened security checks at bus and train stations, churches and markets.
In the 2008 attack, 10 armed terrorists fanned out across Mumbai attacking two luxury hotels, a Jewish center and a railway station.
In March, Mumbai police said they prevented a major terrorist strike after they arrested two Indian men, who, police said, were preparing to hit several targets in the city. Then in September, police issued a terror alert for the city during a popular Hindu festival.