Fire breaks out at nuclear complex, Ukraine says, as Russian forces move through.

After Russian troops fired on the area, a fire broke out at the complex that is home to Europe's largest nuclear power plant.

The security camera footage was filmed early on Friday and shows a building on fire near a line of military vehicles. The people in the vehicles were shooting at the power plant. It is not clear if the vehicles were Russian or Ukrainian.

The condition of the plant was not known. The fire broke out after a Russian attack on a training building outside the perimeter of the plant, according to a statement by the state emergency service of Ukraine.

The foreign minister said that the Russian army was firing from all sides on the Zaporizhzhia complex, which includes the largest reactor site in Europe. He said that a disaster could be ten times larger than Chernobyl, and that Russians must stop fire and allow firefighters to establish a security zone.

The director general of the International Atomic Energy Agency spoke with Ukrainian officials about the situation at the plant. He appealed for a halt to the fighting and warned that the reactors were in danger if they were hit.

The statement from Mr. Grossi's agency said that there had been no change in radiation levels at the plant. The American Nuclear Society condemned the Russian attack on the reactor complex but noted that there are no indications of damage.

Mr. Grossi had said earlier in the day that a large number of Russian tanks and infantry were in the vicinity of the plant.

According to the station's account, the mayor told the radio station that there had been fighting on the approaches to the plant. The mayor called for a cease-fire.

The largest nuclear complex in Europe is located on the Dnieper River in northern Ukraine. According to the International Atomic Energy Agency, its six reactor produce 6,000 megawatts of electric power.

The Chernobyl plant produced about a third less power. A million watt is enough to light 10,000 bulbs. The Chernobyl complex was shut down after one of the reactor's exploded.

Highly radioactive fuel is in the reactor's cores. There are many acres of open pools of water behind the complex where spent fuel rods have been cooled for years. Missiles or shells that hit the sites could cause disasters.

For days, social media reports have detailed how the residents of Enerhodar set up a giant barrier of tires, vehicles and metal barricades to try to block a Russian advance into the city. The barricades were so large that they could be seen from outer space by satellites.

Six of the nation's 15 reactor were offline, as of Sunday, three days into the invasion. The Zaporizhzhia facility was the most offline on Tuesday.