Union Home Ministry has sent an advisory to various states in the wake of intelligence inputs shared by central security agencies that terrorists, especially those owing allegiance to Lashker-e-Taiba may target them, official sources said.
Sources said advisories have been sent to Rajasthan, Himachal Pradesh, Tamil Nadu, Delhi, Karnataka and Maharashtra.
Chabad Houses, the Jewish outreach centres, have also been marked for security checks.
Pakistan-born American terrorist David Headley had carried out reconnaissance of various Chabad Houses and office of Israeli airlines-- El AI--in Mumbai March before his arrest in 2009.
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The Chabad House in Pahargunj, Delhi is located in a narrow lane and is frequented generally by backpackers from Israel on way to Dharamshala in Himachal Pradesh or western parts of the country.
Pushkar, on the outskirts of Ajmer in Rajasthan, Kasol and Manali in Himachal Pradesh, Anujua village in Goa and Koregaon Park in Pune are some of the places put on alert.
Israeli diplomatic staff was targeted by Iranian nationals in Delhi in 2012. It was for the first time that a terror group of a foreign country had conspired in India to target the nationals of another foreign country.