"The fire in the exclusion zone was put out" in the evening, the Ukrainian emergency situations service said in a statement.

"Radiation levels in Kiev, Chernobyl and the power plant have not exceeded normal levels," it added.

Chernobyl polluted a big part of Europe when its fourth reactor exploded in April 1986, with the area immediately around the power plant the worst affected with a 30-kilometre uninhabited exclusion zone surrounding the power plant.

The fire broke out Tuesday morning in a dry grassy area of the exclusion zone, before moving to a forested area 10 kilometres from the power plant, burning some 10 to 15 hectares in total, according to Ukrainian authorities.

A 30 kilometres radius around the power station is still an exclusion zone where people are not allowed to live.

The three other reactors at Chernobyl continued to generate electricity until the power station finally closed in 2000. A giant protective dome was put in place over the fourth reactor in 2016.