Troops deployed as unrest flares again in Tunisia

Troops are on the streets of the Tunisian capital after a curfew was enforced overnight.

Violent protests in Tunis and other towns and cities have killed at least three people.

Officials say 23 people have died since the unrest began late last year - but human rights groups say the toll is much higher.

The BBC's correspondent, Adam Mynott, is in Tunis. He explained the background to the protests.