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The Department of Homeland Security is alerting Texas authorities to be on the lookout for a suspected member of the Somalia-based Al Shabaab terrorist group who might be attempting to travel to the U.S. through Mexico, a security expert who has seen the memo tells FOXNews.com.

The warning follows an indictment unsealed this month in Texas federal court that accuses a Somali man in Texas of running a “large-scale smuggling enterprise” responsible for bringing hundreds of Somalis from Brazil through South America and eventually across the Mexican border. Many of the illegal immigrants, who court records say were given fake IDs, are alleged to have ties to other now-defunct Somalian terror organizations that have merged with active organizations like Al Shabaab, al-Barakat and Al-Ittihad Al-Islami.

In 2008, the U.S. government designated Al Shabaab a terrorist organization. Al Shabaab has said its priority is to impose Sharia, or Islamic law, on Somalia; the group has aligned itself with Al Qaeda and has made statements about its intent to harm the United States.

In recent years, American Somalis have been recruited by Al Shabaab to travel to Somalia, where they are often radicalized by more extremist or operational anti-American terror groups, which Al Shabaab supports. The recruiters coming through the Mexican border are the ones who could be the most dangerous, according to law enforcement officials.