Image copyright Getty Images Image caption Multiple pairs of ruby slippers were made for the film, including these ones displayed in Beverly Hills in 2011

A pair of ruby slippers worn by Judy Garland in The Wizard of Oz has been found 13 years after being stolen, according to US authorities.

They were taken from a Minnesota museum in 2005, when someone broke in through a window late at night.

Three others pairs of ruby slippers worn by Garland in the 1939 film are known to exist.

An anonymous donor once offered a $1m (£775,000) reward for the stolen pair's whereabouts and the thief's name.

However, the reward expired on the tenth anniversary of the robbery.

It is unknown if the shoes' recovery is related to any tip-offs.

In press conference on Tuesday afternoon, no specific details were given about where they were found or how.

FBI special agent Joan Sanborn indicated that the investigation was still ongoing. "We've gathered lots of information on this case. We believe there's lots more to give," she said.

The slippers are often said to among the most valued props in movie history.

This pair was insured for $1m but experts have said they could be worth two times that now.

Image copyright Getty Images Image caption Judy Garland played the lead role of Dorothy Gale in the classic musical

How were they stolen?

The Judy Garland Museum in Grand Rapids, Garland's birthplace, had been loaned the slippers from a collector named Michael Shaw.

The theft was described as a simple smash-and-grab, with the glass display case destroyed and the slippers snatched.

Almost no clues were left behind, neither footprints nor fingerprints, and the surveillance camera was not working that night.

"I literally felt like I was hit in the stomach when I got the call," Mr Shaw told Newsweek in 2015. "My knees buckled, and I went right down on the floor. I had taken care of those shoes for 35 years!"

Jon Miner, the museum's co-founder, told the magazine he was also devastated. "I cried," he said. "I couldn't believe this happened to us because it was the stupidest thing."

The museum has kept the podium - labelled "Dorothy's Ruby Slippers" - empty since they disappeared.

A documentary about the theft - Who Stole The Ruby Slippers? - was released in 2015.

The history of the ruby slippers