LAS VEGAS — A Las Vegas man who has been free on bail for three months while fighting explosives and firearms charges was arrested late Wednesday on counts of terrorism and possession of weapons of mass destruction, authorities said.

Nicolai Howard Mork’s defense attorney, Nicholas Woolridge, expressed shock at the two new charges against his 40-year-old client in Nevada state court, and the $8 million bail amount set by a judge who issued a warrant for his arrest.

Mork had posted $220,000 bail following his arrest in December.

Mork was taken into custody at one of his homes in a southern Las Vegas neighborhood after police evacuated residents from several nearby homes, police Sgt. Jeff Clark said. He called the evacuations a precautionary move.

Mork legally possessed materials commonly used for targets that can explode when shot during firearms target practice, his lawyer said,

Woolridge said similar devices are commercially available and not prohibited under federal law.

Deputy Las Vegas Police Chief Chris Jones declined to specify the materials that police seized Dec. 29 with a search warrant at Mork’s home.