It has been 10 years since the US military opened the Guantanamo Bay prison camp and despite President Barack Obama's promise to close it - it is still home to 171 detainees.

One of them is Canadian Omar Khadr, the only Western prisoner who has not yet been returned to his home country.

Al Jazeera spoke to his sister, who is campaigning for his release.

Cath Turner reports from Toronto, Canada.