The FBI is investigating whether a Texas courthouse break-in by five foreign nationals was a prank or possible act of terror.

The crime at the Bexar County Courthouse triggered a scare, sending FBI agents and bomb-sniffing dogs to the scene.

Some of the men, all in their 20s, were found inside the building. Others were found in a nearby RV.

A full security sweep was conducted before the courthouse re-opened.

Some officials say the event looks like it may have been a prank.

Should officials be concerned about this break-in? CBN News Terrorism Analyst Erick Stakelbeck gave his reaction.  Click play to watch.

Still, the downtown break-in happened blocks away from dozens of U.S. intelligence officials who are in town for an annual convention.

The identities or nationalities of the men weren't immediately released, but officials found 90-day visas in their rented RV.