STOCKHOLM, Sweden (AP) _ Three armed robbers stormed into Stockholm's waterfront National Museum on Friday, made off with a Rembrandt self-portrait and two masterpieces by Renoir, then fled in a waiting boat.

One of the art thieves stood in the lobby with a machine gun while the other two grabbed the paintings in two different rooms, said police spokesman Bjoern Pihlblad said.

The boat the men used was found at Sodermalm, a neighborhood just south of Stockholm.

The Renoirs were titled ``Young Parisian'' and ``Conversation with the Gardener,'' Pihlblad said. The title of the Rembrandt was not immediately clear, nor were the values of the paintings.

Scores of policemen had been assigned to the case, Pihlblad said.

The National Museum's collections includes about 12,500 paintings and sculptures.