Lucknow is at this point closed to Western tourists. From Asia Times, with thanks to EPG:
Over the past week, a spate of protests as well as statements from clerics in the city have warned British, US and Israeli citizens to stay away from the state capital. There are also fears that the demonstrations may spread to the rest of the state, with calls being made to prevent foreigners from entering the precincts of the famous Taj Mahal in Agra, 363 kilometers away from Lucknow. India’s Muslims, especially Shi’ites, have reacted sharply to the clash between US forces and Shi’ite militiamen last month in which one of the most sacred shrines of the Shi’ites, the shrine of Hazrat Ali, was damaged. Muslims form a sizeable population in Lucknow, as well as in Uttar Pradesh as a whole.
Such has been the nature of protests that the British Foreign Office issued a travel advisory on Tuesday warning its citizens against traveling to the city, as well as to postpone visits to holy sites. Visitors have been told to keep a safe distance from particular religious sites such as the imambaras (religious monuments) in Lucknow that are replicas of the holy shrines in Najaf and Karbala that were damaged by fighting in Iraq. It is rare for city-specific travel warnings to be issued as they are usually applied to a country as a whole in the wake of a terrorist attack, threat or such macro parameters. The last time the US and British offices issued a travel warning to its citizens concerning India was in 2002 when Indian and Pakistan relations reached a flashpoint and several signs indicated the two countries could go to war.