SAN JUAN, Puerto Rico — A Puerto Rican nationalist on the run since 1983, when he allegedly took part in one of the largest bank robberies in US history, was arrested yesterday as he took a morning stroll, the FBI said.

Authorities say Norberto Gonzalez Claudio was involved in the $7 million robbery of a bank depot in Hartford, Conn., as a member of the militant independence group Los Macheteros.

Gonzalez — one of two remaining fugitives in the case — calmly admitted his identity yesterday, and then refused to say another word, said Luis Fraticelli, special agent in charge of FBI operations in Puerto Rico.

“He seemed surprised,” but did not put up any resistance, Fraticelli said.

Gonzalez, 65, was living alone in a modest home under a false name, and authorities believe he still had an active role in the militant group.