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Jackie Morris, right, and her three children were last seen leaving a motel in Vernon, Conn., on May 11, 2014. (Photo: Vernon Police Department)

VERNON, Conn. (PIX11/AP) — Three brothers taken by their mother after a scheduled weekend visit, sparking a multi-state Amber Alert for their safe return, have been found in Maine, police said.

Issuing the alert Tuesday morning, police in Vernon said they had cause to be concerned for the well-being of a 9-year-old boy and his 7-year-old twin brothers.

Their 32-year-old mother, Jackie Morris, was last seen Sunday morning leaving a Vernon motel with her three sons, a police spokesman said at a 10 a.m. news conference.

The boys were supposed to be returned to their father that night, and had not been to school all week, the spokesman said.

Police asked for drivers’ help to find Morris’ red 2004 Volkswagen Jetta. It was not immediately known how police were led to the family in Maine, where Morris recently lived before moving to Connecticut. She also has ties to Massachusetts.

Morris and her children were found in Bangor, about 317 miles northeast of Vernon, police said in a noon update.

Detectives said they believe Morris is homeless and has a “history of mental health ailments.”

Police said that “based on prior contact” with the family, investigators had cause to be concerned for the boys’ well-being, but would not go into detail.

Court records indicate Morris and the children’s father were involved in a child custody case. Police say Morris didn’t have custody of the children.