New Delhi: In the backdrop of US terror suspect David Headley's several visits to India, the Centre warned five states, including Uttarakhand and Maharashtra, against terrorist attacks particularly targeting military training academies.

The home ministry sources said the alerts were issued as Headley, arrested by the FBI for allegedly plotting an attack in India for terror group Lashkar-e-Tayyaba, on suspicion that during his stay in India between 2006 and 2009 he may have done a recce of some vital installations in India for carrying out strikes.

Home ministry sources said the warnings had been issued to Uttarakhand, Gujarat, Uttar Pradesh, Delhi and Maharashtra as a precautionary measure after it was found during investigation that Headley had visited Mumbai, Ahmedabad, Lucknow, Agra, Delhi and done a recce of National Defence College and vital installations in other cities.

The sources said it is possible that Headley has established sleeper cells in these states. He was also conducting recruitment of cadres for Pakistan-based terror group LeT, for sending them to a Gulf country using the services of his immigration business set up in Mumbai.

The states alerted have been asked to coordinate with the army authorities as well as the administration of the Indian Military Academy in Dehradun and Khadakwasla about the security to the vital nstallations.