A 16-year-old girl who visited her boyfriend in prison in Austria ended up in jail overnight after guards forgot about her.

The teenager, from Graz, only expected to be allowed an hour visit with her 20-year-old boyfriend, who is serving a two year sentence for drugs offences at the Judenburg prison.

But she ended up spending the night with him inside the visitor's room.

She said: "I noticed after about an hour-and-a-half that nobody had knocked to say our time was up, and thought we had just got lucky.

"After two hours I realised I needed to get home and rang the bell for them to let me out, but nobody came. I couldn't even call my mum to tell her where I was because they made me hand my mobile in."

The pair were found at 7.30am the next morning by cleaning staff.