There are several theories that McVeigh and Nichols had a possible foreign connection or co-conspirators . This was due to the fact that Terry Nichols traveled through the Philippines while terrorist mastermind Ramzi Yousef of the 1993 World Trade Center bombing was planning his Project Bojinka plot in Manila . Ramzi Yousef placed the bomb used in the 1993 World Trade Center bombing inside a rented Ryder van , the same rental company used by McVeigh , indicating a possible foreign link to Al-Qaeda . Other theories link McVeigh with Islamic terrorists , the Japanese government , and German neo-Nazis
Bojinka plot
Bojinka plot
Oklahoma City bombing conspiracy theories