Michigan State Attorney General Mike Cox is expected to announce he is launching his own investigation into allegations of criminal wrongdoing by Detroit Mayor Kwame Kilpatrick and some members of his security staff.

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Wayne County Sheriff Warren Evans turned down a request to investigate the allegations, saying the Sheriff's Department is not ideally equipped to handle it on their own. U.S. attorney Jeffrey Collins said Friday that it does not fall under his jurisdiction.

The Detroit City Council and Police Chief Jerry Oliver had requested a federal inquiry, Local 4 reported.

The May 9 firing of Deputy Police Chief Gary Brown reportedly sparked the allegations.

Kilpatrick said Gary Brown was fired because he violated a trust, but did not explain exactly how the trust was violated.

"I think that would put us in a position where we're giving too much information about the sensitivities of what's being handled there," Kilpatrick said last week.

Kilpatrick said Brown could return to the department as a lieutenant, but he said he would never be reappointed as deputy chief of internal affairs. Brown said he would not be returning, according to Local 4 reports.

Michigan State Police are investigating allegations of drunken driving, falsified overtime records and cover-ups by two members of the mayor's security detail. They are also looking into allegations of an assault during a wild party at the mayor's Manoogian Mansion, according to the station's reports.

Cox is expected to make the announcement at 10 a.m. in Detroit. The Attorney General reportedly had concerns that the investigation would be tainted and decided to launch his own.