WASHINGTON, Aug 20 (AFP) - Federal authorities issued a worldwide alert late Tuesday for a Saudi national suspected of ties with those who conducted deadly September 11 suicide attacks.

Saud al-Rasheed is to be considered armed and dangerous, the US Federal Bureau of Investigation said in a statement. The statement said authorities do not know where he might be found.

The FBI also released a passport photo showing Rasheed, 21, wearing a traditional red-and-white checkered headdress common in Saudi Arabia.

The bureau is seeking Rasheed based on recent analysis of evidence previously collected which contained an image of Rasheed's passport, issued in Riyadh, his birthplace, in May 2000.

"On August 15, 2002, materials previously recovered during the war on terrorism were found to be related to several of the September 11th hijackers," the FBI said.

Rasheed is the 15th person sought in connection with the attacks with hijacked airliners which killed 3,000 people.

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