Dr M on 9/11

Tun Mahathir said that the September 11 attacks on the US that killed nearly 3,000 people could have been 'staged'..

" I am not sure now that Muslim terrorists carried out these attacks. There is evidence that the attacks were staged."
" If they can make Avatar, they can make anything."
" But whether real or staged. the 9/11 attacks have served the US and western countries well.
They have an excuse to mount attacks on the Muslim world."

Could it be possible ?