Poison threat from Ukraine train

Several Ukrainian villages are at risk from a giant poisonous cloud that formed after a train carrying a toxic chemical caught fire and derailed.

The cloud covers an area of 90sq km (56sq miles) above some 14 villages near the town of Lviv.

Hundreds of villagers from the area have been evacuated and at least 20 people have been taken to hospital.

The fire aboard the train carrying highly flammable yellow phosphorous was put out late on Monday, reports say.