Speculation has continued to center around Saudi millionaire Osama bin Laden and his possible involvment with Tuesday’s attacks. Secretary of State Colin Powell yesterday named bin Laden a prime suspect.

“We are looking at those terrorist organizations who have the kind of capacity that would be necessary to carry out the attack that we saw on the 11th [of September],” Powell said at a press briefing. “We haven’t yet publicly identified the organization we believe was responsible, but when you look at the list of candidates, one resides in that region.”

When pressed, Powell said the one candidate was bin Laden.

And while no definite plans for military action have been publicly outlined by the Bush administration, officials say they will wage “a campaign, not a single action” to destroy the terrorist groups responsible for Tuesday’s attacks, as well as to bring down the governments that harbor them.

Bin Laden currently resides in Afghanistan, leading to speculation that the U.S. may take action against the country in the near future. In a possible preparatory move, govermnment officials have asked Pakistani leaders to close their border with Afghanistan, provide any information on bin Laden and allow U.S. planes access to Pakistani air space in the event of a future military strike.