The central bureau of investigation probing the coal subsidy scam on Tuesday raided the residence of former AIDC managing director Noor Mahammad. The raid was conducted at his residence in Hajo in connection with coal subsidy scam. The country’s premier investigation agency is yet to disclose the details of the three hour long raid. CBI seized some documents from his Guwahati based residence in September. CBI is likely to conduct more raids in some other places to probe the 70 crore rupee scam.