US terror suspect David Headley had visited Nariman House before the Mumbai carnage and even entered the targeted Jewish Centre posing as a Jew . <br/><br/>The Official sources said the attack by Lashker-e-Taiba(LeT) terrorists last year in the five-storeyed house, had left the security agencies without any doubt that a proper investigation had been conducted prior to the 26/11 attack The sources said, statements of some of the witnesses who had either seen or accompanied the Headley to Nariman House, have been recorded . Headley had stayed at the Oberoi Hotel for four days in April last year and also stayed in the Taj Mahal Hotel. Later he had left India reportedly for Pakistan through a Gulf country. <br/><br/>Headley is currently in FBI custody in the US for allegedly plotting attacks in India<br/>