BALTIMORE (AP) — A man accused of kidnapping his 7-year-old daughter during a supervised visit in Boston last weekend was arrested Saturday in Baltimore and the girl was found safe, authorities said.

A "concerned citizen" tipped off authorities that the man known as Clark Rockefeller was living in a Baltimore apartment and had a 26-foot catamaran sailboat docked at a nearby marina, Boston Police Commissioner Ed Davis said.

Rockefeller will be arraigned Monday to begin extradition proceedings. He is charged with felony custodial kidnapping, assault and battery and assault and battery with a dangerous weapon, Davis said.

Investigators invented a ruse to get Rockefeller out of the apartment and away from the child. They called him and told him that his boat was taking on water.

He was arrested when he left the apartment, Davis said. The girl, Reigh Boss, was found apparently unharmed inside.

The arrest ended a suspenseful week that began in Boston's Back Bay neighborhood when police said Rockefeller attacked and fled from a social worker during a supervised visit with his daughter.