The poor public security situation accelerated the rise in the number of private security companies, but the presence of so many security guards has made residents feel less secure, an official said.

一位公共安全厅官员认为，私人保安公司数量增多源于治安状况不好，但私人保安人员数量如此之多，又加剧了居民的不安全感。

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"So there may be situations in which the taking of photographs may cause or lead to public order situations, inflame an already tense situation, or raise security considerations, " it said.

BBC: Is it a crime to take pictures?

However, Sao Paulo's public security secretary, Antonio Ferreira Pinto, has suggested that other criminals may be exploiting the situation to carry out attacks and let the police take the blame.

BBC: Sao Paulo police at war with prison gang