Link:WASHINGTON (AFP) - Al-Qaeda will release a third video marking the sixth anniversary of the September 11 attacks, this time showing its top leader in Afghanistan, US monitoring groups said Wednesday.After releasing two videos featuring Al-Qaeda chief Osama bin Laden in recent days, the terror network will now show a video "presenting reasons and motives for the attacks on New York and Washington," the SITE Intelligence Group said in a press release.The new video will show Al-Qaeda's chief in Afghanistan, Mustafa Abu Al-Yazid, also known as Sheikh Said, said SITE, which monitors Islamic extremist websites.The tape also features