Toronto police say they have no reason to suspect foul play in the three-day long disappearance of a girl who first arrived in Canada three months ago. Mariam Makhniashvili has been missing since Sept. 14. (Toronto Police)

Mariam Makhniashvili, 17, was last seen by her family when she left for school with her brother on Monday morning near Bathurst Street and Eglinton Avenue West. They entered by different doors.

The girl did not arrive home from Forest Hill Collegiate Institute, and the parents began looking for her and contacted police, who say they are concerned for her safety.

The parents appealed at a news conference Thursday for their daughter to contact them.

"I just ask to anybody, or to her, to return her or to let her go," said her father Vakhtang Makhniashvili.

"We all love you. We miss you. We want you back," her mother, Lela, said as she fought back tears.

The parents said there was no dispute that would have prompted the girl to run away.

"No. She was an absolute perfect student — perfect daughter," her father said. "She was absolutely happy."

Authorities, however, have no reason to believe foul play was involved, said Const. Wendy Drummond of the Toronto Police Service.

Det. Steve McIlwain said there's still cause for concern.

"She is new to Canada. The Toronto police have concerns for her safety as she is not familiar with Toronto or Canada," he said.

Moved from Republic of Georgia

The school principal said Mariam did not attend classes Monday.

The parents lived in Los Angeles for five years before moving to Toronto earlier this summer, while the girl and her brother lived with their grandparents in the Republic of Georgia.

The family was reunited when the children moved to Toronto in June. Mariam's father said she had not yet made friends, since school had just started. The family had moved to Canada for a better life, he said.

He said his daughter knows about calling 911, and police said she knows enough English to make herself understood. She did not have a cellphone.

Staff Insp. Larry Sinclair added his voice to the appeal. "Please call a family member, a friend, the police and let us know you're safe," he urged the girl.

Lela Makhniashvili said they would have detected any change in their daughter to indicate she was having problems.

"We haven't noticed anything," she said. "We would notice anything."

She said it has been hard not knowing where Mariam is: "It's very hard to express. But we're coping. We're hoping she'll be back with us."

Principal Peggy Aitchison said the school is ready to mobilize an army of "a thousand" parents to look for the girl: "We've had tremendous emotional support back from our parents. We have asked students to be aware and let us know if there's something out of the ordinary that happened during the first week of school."

The girl is described as five foot three with light-brown shoulder-length hair and brown eyes. She was last seen wearing black pants, a light blue shirt and a dark blue jean jacket. She was carrying a large black backpack with a green stripe.