AN attempt to give some prisoners a say in the independence referendum has been defeated.

Deputy First Minister Nicola Sturgeon, backed by Labour and Tory politicians, said convicted prisoners should be refused a vote while in custody.

"I'm not yet persuaded of the case that is being made," Ms Sturgeon said.

She responded to calls from Green and LibDem MSPs who believe the system breaches human rights.

The issue was debated during scrutiny of the Scottish Independence Referendum (Franchise) Bill, which aims to reduce the voting age limit to 16.

Ms Sturgeon rejected a range of proposals on prisoner voting during discussions at the Referendum Bill Committee.

The European Court of Human Rights has ruled that the UK Government must present plans for allowing prisoners to take part in elections, with a direct impact on Scotland. Prime Minister David Cameron says inmates will not be allowed to vote under his administration.