Authorities in Shanghai have shut down newly opened sleeping capsules in office buildings, citing fire hazards and other reasons.

Similar to capsule hotels in Japan, the sleeping capsules showed up in three office buildings in Shanghai and in buildings in several other cities. They are designed to offer white-collar workers a space to take a break, day or night.

The clampdown in Shanghai came after suspensions of the service in Beijing and Chengdu, Sichuan province.