The National Investigation Agency is scrutinizing the documents collected by the Mumbai crime branch during its probe in US terror suspect David Headley's Mumbai links. NIA is also likely to question Ajmal Kasab, the lone surviving terrorist involved in the 26/11 terror attacks. The NIA wants to know from Kasab whether he had ever come across Headley or his Canadian accomplice Tahawwur Hussain during his training sessions in Muridpur, Pakistan.<br/><br/>NIA officials, probing Headley's connection with the 26/11 terror plot, have visited the places where Headley stayed to get a first hand experience of the facts. Headley had spent much of his time in India between 2006 and 2009 and, in Mumbai, stayed in a rented flat at Breach Candy and ran an immigration business from the Tardeo AC market. He came here on as business Visa.<br/><br/>