At first, several X users that identified as "OSINT"—or open-source intelligence—pointed out the fire developing at the largest nuclear power plant in Europe (able to generate 6,000 megawatts for four million homes). 

About 15 minutes later, around 1500 ET, Ukrainian President Volodymyr Zelensky confirmed on X that "Russian occupiers have started a fire on the territory of the Zaporizhzhia Nuclear Power Plant."

Zelensky continued:

Currently, radiation levels are within norm. However, as long as the Russian terrorists maintain control over the nuclear plant, the situation is not and cannot be normal.

Since the first day of its seizure, Russia has been using the Zaporizhzhia NPP only to blackmail Ukraine, all of Europe, and the world.

We are waiting for the world to react, waiting for the IAEA to react. Russia must be held accountable for this. Only Ukrainian control over the Zaporizhzhia NPP can guarantee a return to normalcy and complete safety.

Zaporizhzhia NPP has come under shelling and drone attacks in the past. The United Nations nuclear watchdog agency, the International Atomic Energy Agency, has issued numerous warnings about the plant dangerously close to suffering an accident or attack. 

According to Russian state-controlled Russia Today, the fire at Zaporizhzhia NPP's cooling systems facility was the direct "result of Ukrainian shelling of Energodar city - local authorities." At this moment, it really depends on the source for who is responsible for the fire. Welcome to the 'fog of war'.