<p>Malfunctions have occurred in the cooling systems of the two units, Kyodo news agency said, citing a top state official. "Temperatures have been rising slightly. This requires attention," Chief Cabinet Secretary Yukio Edano told reporters, according to RIA Novosti.<br /><br />Cooling systems of the Fukushima plant failed after the building was damaged following the massive earthquake last week, resulting in blasts in reactors number 1 and 3 Monday. <br /><br />The reactor number 2 also overheated Monday, but the injection of water into the unit restarted it a few hours later, RIA Novosti reported.<br /><br />Early Tuesday, a fourth reactor was hit by a blast, causing leakage of radioactive materials from the plant.<br /><br />The Japanese transport ministry declared a no-fly zone within the range of 30 km from the blast-hit plant earlier in the day.</p>
<p>Malfunctions have occurred in the cooling systems of the two units, Kyodo news agency said, citing a top state official. "Temperatures have been rising slightly. This requires attention," Chief Cabinet Secretary Yukio Edano told reporters, according to RIA Novosti.<br /><br />Cooling systems of the Fukushima plant failed after the building was damaged following the massive earthquake last week, resulting in blasts in reactors number 1 and 3 Monday. <br /><br />The reactor number 2 also overheated Monday, but the injection of water into the unit restarted it a few hours later, RIA Novosti reported.<br /><br />Early Tuesday, a fourth reactor was hit by a blast, causing leakage of radioactive materials from the plant.<br /><br />The Japanese transport ministry declared a no-fly zone within the range of 30 km from the blast-hit plant earlier in the day.</p>