U.S. Federal agents arrested a Mississippi martial arts instructor early Saturday morning after his home and a former business were searched as part of an investigation into ricin-laced letters sent to President Barack Obama and two other public officials.

Everett Dutschke, 41, was taken into custody by U.S., marshals at his Tupelo home without incident, the city's police chief, Tony Carleton, told Reuters.

Federal agents from the FBI and the U.S. Capitol Police, as well as members of an anti-terrorist response team from the Mississippi National Guard, had earlier searched Dutschke's home on Tuesday and Wednesday, as well as the premises of a former martial arts studio Dutschke ran in the city.

U.S. prosecutors dropped charges on Tuesday against another Mississippi man, Elvis impersonator Paul Kevin Curtis, who was released from jail after a search of his home in nearby Corinth revealed no incriminating evidence.