9/11 CONSPIRACY!!!!
Conspiracy theory meansa theory that explains an event as being the result of a plot by a covert group or largely unknown to the general public.

The official Conspiracy story of 9/11 that government claims that there were 19 hijackers plot together to hijack four planes those were American Airlines 11 and 77, and Untied Airlines 175 and 93. Where Flights 11and 175 were crashed into Twin Tower, and the two flights crashed into the Pentagon to spread the terror in the world. Since 9/11 number of theories have been put forward. But, the media reported that Al Qaeeda agents led by Osama Bin Laden carried out the conspiracy behind the demolish of Twin Tower and spread the terror in the world. Then NC TA made a 9/11 commission report and said that government was aware of this terror activity given by Al Qaeeda but they ignored those warnings due to lack of communication between various law enforcement and intelligent personnel.
But, no matter what this is the biggest conspiracy in the history which this generation couldn't forget about it.