Swedish news site dn.se reports that the images showed pictures of young men moving around the T-Central subway station. The men are suspected of being involved in an assault.
Anna Ramberg, secretary general of the Swedish Bar Association, told dn.se that "There is a huge risk of identifying innocent people. We have to remember that they are innocent until proven guilty in a court of law."
"We don't know if they have committed the crime. Perhaps they are witnesses. Spreading this information through social media can have unintended consequences."
After police posted the images on Facebook, they started to spread on the Internet. Many people posted insulting, racist comments, including mention of the men's skin color and possible origin. Some of the comments were removed by police Tuesday.
About 4,700 people follow Stockholm's Södermalm police on Facebook. Alltogether there are about 35 police Facebook accounts in Stockholm and more than 10 Twitter accounts, according to dn.se.