“Powerful explosions” were reported around the Zaporizhzhia nuclear power plant in eastern Ukraine on Saturday and Sunday, ending a “period of relative calm” there and raising new concerns of possible accidents, the International Atomic Energy Agency said. Russian state news agency Tass, citing a Rosenergoatom official, reported that Ukrainian forces were firing at the nuclear plant. Ukrainian energy agency Energoatom blamed Russian forces for the shelling. The Washington Post could not independently verify these claims.