US authorities make arrest in ricin probe

US authorities have arrested a man as part of a probe into poison-laced letters sent to President Barack Obama and others, police said Saturday.

Everett Dutschke was taken into custody "without incident" at his home in Tupelo, Mississippi, around 1 am Saturday morning, Scott Floyd of the Tupelo Police Department told AFP.

Dutschke has been turned over to the US Marshals Service, Floyd added. He declined to provide more information.

Three letters laced with ricin were discovered last week as the nation was reeling from a deadly bombing at the Boston Marathon.

They were addressed to Obama, Republican Senator Roger Wicker of Mississippi and a justice of the peace in the same US state, Sadie Holland.

Authorities had initially arrested another man in the case but the charges against him were later dismissed and he was released from jail.