Police work at the site of a shooting incident in Hyvinkaa, Finland, May 26, 2012. (Xinhua/Tong Shuai)

HELSINKI, June 6 (Xinhua) -- The revelation by an internet magazine about a closed social media group of Finnish police officers have resulted in an official investigation in Finland.

Internet investigative magazine Long Play reported last week that it had found racist comments in the posts in the Facebook group.

The 2,400-member group is restricted to current and former police officers. Finnish national broadcaster, Yle said there were about 7,250 police officers in Finland last year.

Finnish Minister of the Interior Paula has ordered a thorough review.

Police force management has submitted some content to the state prosecution for evaluation of a possible crime. Finnish News Agency STT reported Monday night that a civilian had filed a criminal complaint about the group a month ago.

Among the implicated police officers was Marko Forss, who was the first internet policeman in Finland. He was known as "Internet Police Officer Fobba" by many netizens. He was awarded Finland's Police Officer of the Year in 2011 for his efforts to keep order in social media.

Forss had been one of the moderators of the Facebook group before he reportedly left the group in April.

Helsinki police commander Lasse Aapio told Yle on Monday that Forss cannot continue as the leading inspector of a hatred speech criminality task force.

Seppo Kolehmainen, the national police director, told STT earlier that the police management is not under obligation to control what the officers do during off-hours.

Participating officers were not required to report about the contents as it was not "a serious crime", said Kolehmainen.

Kolehmainen told STT that the police management knew about the group but did not know about the contents.