Chernobyl nuclear disaster: Ukraine marks anniversary

Ukraine is marking the 25th anniversary of the world's worst nuclear accident - at the Chernobyl power plant.

An explosion at one of the plant's reactors sent a plume of radiation across Europe and killed at least 30 people in its immediate aftermath.

The accident forced the evacuation of hundreds of thousands of people from their homes in Ukraine, western Russia and Belarus.

There is still a 30km (19 miles) exclusion zone around the plant.