Chinese authorities on Monday detained a law professor who published essays criticising President Xi Jinping over the coronavirus pandemic and accusing him of ruling “tyrannically”, according to friends of the man. Xu Zhangrun, a rare outspoken critic of the government in China’s heavily censored academia, was taken from his home in suburban Beijing by more than 20 people, one of his friends said on condition of anonymity. Xu published an essay in February blaming the culture of deception and censorship fostered by Xi for the spread of the coronavirus in China.