So, it seems that there are four men who helped with the 9/11 attacks that are still out there. Apparently, the government is unable to prosecute these men due to lack of evidence. Well, there are other ways to handle these things besides in a court of law in the US.

As many as four men from Qatar are suspected of aiding the Al Qaeda hijackers in the Sept. 11, 2001, terror attacks, but investigators concluded in the days following the attacks that there was insufficient evidence to charge the suspects, law enforcement sources told Fox News on Tuesday.

Officials spoke after The (London) Daily Telegraph published leaked diplomatic cables obtained by WikiLeaks that were sent between the U.S. embassy in Doha and the Department of Homeland Security in Washington.

The documents reveal that on Aug. 15, 2001, three men from Qatar flew to the U.S. from London. They visited New York City and Washington D.C., and made trips to the World Trade Center, the Statue of Liberty, the White House and "various areas" in Virginia.

They then flew to Los Angeles where they checked into a hotel and stayed for several days, checking out on Sept. 10.

According to the memo, "hotel cleaning staff grew suspicious of the men because they noticed pilot type uniforms, several laptops and several cardboard boxes addressed to Syria, Jerusalem, Afghanistan and Jordan in the room."