Ukrainian guards who were at the Chernobyl Nuclear Power Plant when the Russians arrived had been unable to leave. Normally they would change shifts daily and would not live at the site. They had limited supplies of medication, food, and electricity. According to Ukrainian reports, the radiation levels in the exclusion zone increased after the invasion. The higher levels are believed to be a result of disturbance of radioactive dust by the military activity or possibly incorrect readings caused by cyberattacks. On 10 March, the International Atomic Energy Agency stated that it had lost all contact with Chernobyl. On 22 March, the Ukrainian state agency responsible for the Chernobyl exclusion zone reported that Russian forces had destroyed a new laboratory at the Chernobyl nuclear power plant. The laboratory, which opened in 2015, worked to improve the management of radioactive waste, among other things. "The laboratory contained highly active samples and samples of radionuclides that are now in the hands of the enemy, which we hope will harm itself and not the civilized world", the agency said in its statement. On 27 March, Lyudmila Denisova, then–Verkhovna Rada Commissioner for Human Rights, said that 31 known individual fires covering 10,000 hectares were burning in the zone. These fires caused "...an increased level of radioactive air pollution", according to Denisova. Firefighters were unable to reach the fires due to the Russian forces in the area. These wildfires are seasonal; one fire that was 11,500 hectares in size took place in 2020, and a series of several smaller fires occurred throughout the 2010s. On 31 March, it was reported that most of the Russian troops occupying Chernobyl withdrew. An Exclusion Zone employee made a post on Facebook suggesting that Russian troops were suffering from acute radiation sickness, based on a photo of military buses unloading near a radiation hospital in Belarus. Chernobyl operator Energoatom claimed that Russian troops had dug trenches in the most contaminated part of the Chernobyl exclusion zone, receiving "significant doses" of radiation. BBC News reported unconfirmed reports that some were being treated in Belarus. On 3 April, Ukrainian forces retook the Chernobyl power plant. Population The 30-kilometre zone is estimated to be home to 197 samosely living in 11 villages as well as in the town of Chernobyl. This number is in decline, down from previous estimates of 314 in 2007 and 1,200 in 1986. These residents are senior citizens,