US President George Bush said today the United States had yet to make a link between anthrax attacks in America and Osama bin Laden's network.
"I don't have knowledge of a direct link to the enemy," Mr Bush said. "But I wouldn't put it past them."
But at a news conference with Chinese President Jiang Zemin, Mr Bush raised the possibility of homegrown terrorism in the attacks.
"I want to say this as clearly as I can, that anybody in America who will use this opportunity to threaten our citizens, will think it's funny as a hoax to put out some kind of threat, will be held accountable and will be prosecuted," Mr Bush said.
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Mr Bush came to Shanghai for an Asia Pacific Economic Cooperation summit despite an anthrax scare sweeping parts of the US.