A rights group says cases of torture in Tunisia are falling but abuses continue in prisons and detention centres.

The Tunisian Organisation Against Torture says it reported 153 cases in the North African country last year. There were 250 cases in the previous year.

In a report, it accused authorities of abuses including arbitrary arrest, ill-treatment and threats or attempts at rape.

It says the police were responsible for more than 60% of the abuses, followed by prison wardens and the National Guard.