The Mexican border is being used to smuggle Abrabs into the United States.

In November of 2003, an Arab-smuggling ring with a former Mexican diplomat, was broken up by U.S. authorites.

A key leader in the bombing, entered the U.S. by Mexico, by becoming a legalized agricultural leader as part of a 1986 amnesty program. After he was legalized, he made several trips to terrorist training camps in Afghanistan and Pakistan for al-Queda agents.

Others have come across the Mexican border disguised as immigrants.