BISE Lahore 9th Class Result 2012

It is hereby that 9^th class result 2012 was going to announce on 4^th August, but it is delay and will be announced on 15^th of August. But question is this, what the reason behind it? Why it is delay and is the 15^th August final date of result announcement. There are many rumors about delay of result; such as some says that it is due to the negligence of board authority, who not prepares result within time. So according to the Chairman of Lahore