Police in Shanghai were out in force over the weekend to crack down on Halloween festivities, amid concerns that revelers would once again turn up in costumes considered politically sensitive.

The government in Shanghai wants to convert the world’s busiest port into a center for greener shipping. China’s biggest city aims to build its capacity to supply cleaner fuels in preparation ...

A heavy police response has stifled Halloween celebrations in Shanghai, in what many have viewed as an attempt by authorities to crack down on large public gatherings and freedom of expression.