Police officers stand guard as ice is blasted to create safe passage for ships on the still-frozen Tahe section of Heilongjiang River in Northeast China's Heilongjiang Province, April 3, 2019. As the weather starts to warm after the extreme cold of winter, local authorities detonate the thick ice to allow vessels to start work again. (Photo/China News Service)
Police officers stand guard as ice is blasted to create safe passage for ships on the still-frozen Tahe section of Heilongjiang River in Northeast China's Heilongjiang Province, April 3, 2019. As the weather starts to warm after the extreme cold of winter, local authorities detonate the thick ice to allow vessels to start work again. (Photo/China News Service)
Police officers stand guard as ice is blasted to create safe passage for ships on the still-frozen Tahe section of Heilongjiang River in Northeast China's Heilongjiang Province, April 3, 2019. As the weather starts to warm after the extreme cold of winter, local authorities detonate the thick ice to allow vessels to start work again. (Photo/China News Service)