A break-in at an historic building in Texas that sparked fears of a possible terrorist attack Wednesday now appears to be what officials describe as a prank.

Officials in Bexar county say surveillance video from inside the 120-year-old courthouse shows some suspects dancing around in sombreros and playing with a judge's gavel before they were arrested.

Police had earlier said the five men – all in their 20s – were from Morocco, and that two of the five had been in a vehicle with materials thought to show buildings and other critical infrastructure.

The men had been questioned by counter-terrorism officials but an FBI spokesman told VOA there was nothing to indicate there was any imminent threat to the public.

San Antonio radio station WOAI reports the five men entered the United States with legal travel visas. They arrived from London's Heathrow Airport.

Immediately following the arrests early Wednesday morning, law enforcement officials checked the scene with bomb-sniffing dogs. No weapons or explosives were found.