BEIJING – China is increasing Covid-19 restrictions in southern manufacturing powerhouse Guangzhou, suspending schools and widening lockdowns after days of more incremental moves failed to arrest a swelling outbreak. In-person classes in eight of the city of some 19 million people’s 11 districts will be halted from Thursday, officials said late on Wednesday. The order came after two more districts followed the Haizhu region in locking down, with residents confined to their homes except to shop for essential items like food. Guangzhou has China’s most significant virus outbreak right now, accounting for 2,555 of the country’s 8,494 new infections reported...