BEIJING (AP) — The city of Shanghai is doubling down on pandemic restrictions after a brief period of loosening up, frustrating residents who were hoping a more than monthlong lockdown was finally easing as the number of new cases falls in China’s financial center.

On Tuesday, service was suspended on the last two subway lines that were still operating, marking the first time the city’s entire system has been shut down, according to The Paper, an online media outlet.

Teams in white protective suits have begun entering the homes of coronavirus-infected people to spray disinfectant, prompting worries among some about damage to clothes and valuables, and about leaving their keys with a community volunteer when they are taken to quarantine — a new requirement so disinfectant workers can get in.

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