A quarter of a century after the world's worst nuclear accident some wonder whether its lessons have yet been learnt.

Chernobyl, 25 years on

Here in the city of Colmar  in eastern France

the Chernobyl nuclear blast  is still fresh in people's minds.

These anti-nuclear activists have been  fasting for days in front of the Préfecture

to demand the closure of the Fessenheim  nuclear power plant, France's oldest,

The lessons of Chernobyl  have not been learnt...

There have been technical failures  at the Forsmark plant in Sweden.

Nuclear meltdown was 7 minutes away.  This was three years ago.

25 years on,  the city of Chernobyl in Ukraine

is still a highly radioactive,  abandoned area.

Official figures put  the number of dead at 4,000.

MEP Michèle Rivasi, who visited Ukraine,  believes the figure could be much higher.

At first the International  Atomic Energy Agency reported 53 dead.

Other institutions speak of 100,000  to one million dead, in the years to come,

because cancer can manifest itself  up to 30 years later.

To combat the release of radiation  from the Chernobyl plant,

the European Commission  has invested 580 million euros

in the construction of a sarcophagus  around the reactor.

The United Nations, the European Union,  the Red Cross and civil society

are all helping in minimising  the health effects on the population,

The results of the stress tests on EU  nuclear plants should be known this year.

They are eagerly awaited, given the  consequences of the Chernobyl disaster.