Security was tightened at the Lucknow railway stations on Monday after a letter, purportedly from Al-Qaeda, claimed that mines and other explosives have been planted at one of the stations, a top official said. Principal Secretary, Home, Alok Sinha told reporters that bomb disposal squads are on the lookout for any possible explosives at the Charbagh railway station where security was beefed up. He said the letter claiming that explosives have been planted at Charbagh station was received by the Divisional Manager of North-Eastern Railway on Monday. Full Story