A man at the helm of a tug boat and barge that crashed into a sightseeing "duck boat" in the Delaware River in Pennsylvania last year - an incident that killed two tourists - has been sentenced to a year and a day in prison, federal prosecutors said Tuesday.

Matthew R. Devlin, of Catskill, New York, was sentenced for misconduct of a ship operator causing death, according to a U.S. attorney's office.

Two tourists from Hungary - one 16 years old, the other 20 - died when a 250-foot sludge barge towed by the tugboat overran a disabled 33-foot "Ride the Ducks" tour boat on the Delaware River in July 2010, plunging the amphibious vessel and its 35 passengers and two crew members underwater.