Portuguese investigators are "100 percent sure" missing toddler Madeleine McCann is alive, Britain's Sunday Mirror reports.

Francisco Marco, a private eye hired by the McCann family to track the missing girl - who would be 4 years old if she's still alive - told The Mirror he is "sure she was abducted."

"We are very, very close to finding the kidnapper," he said.

A Portuguese tipster told the PI that she saw Madeleine inside a van with a woman two days after she went missing.

The tipster then identified the woman from the van in photographs shown to her by detectives.

The investigators believe Madeleine was abducted in a carefully planned operation and moved out of the country. They are close to locating the woman from the photographs.

A friend of the McCann family said Madeleine's parents, Kate and Gerry, are "encouraged by what investigators are saying and have been given new hope."

Madeleine McCann went missing in May while on vacation with her family in Praia de Luz, Portugal.

Her parents left the toddler and her 2-year-old twin siblings alone in a hotel room when they went to dinner nearby.

Her parents have been on-again, off-again suspects in Madeleine's disappearance.