Surveillance video showed the men walking into the building with an item in their hands, but they did not have the item when they walked out of the courthouse, sheriff's officials said. Investigators have not said whether that item was recovered or what it may be.

The RV contained several documents and proof the men had been traveling across the country for some time, sheriff's officials said.

Sources told ABC News that three of the men appear to be of Morroccan descent and that the men had pictures of courthouses and water systems from around the country.

The men are apparently not cooperating with investigators and are refusing to answer questions, sources told ABC News.

The men told authorities they broke into the courthouse to get a scenic view of San Antonio, but investigators said the circumstances surrounding the break-in are suspicious.