ELK RIVER (AP) -- A county with the second largest jail in Minnesota has responded to U.S. Immigration and Customs Enforcement's request for more space to hold an estimated 500 immigration detainees.

The federal agency sought proposals for additional detention space near its St. Paul office in March. Sherburne County responded by saying it could expand its jail to add 200 more beds for individuals suspected of violating immigration laws.

The jail in Elk River already provides 300 beds for the agency's detainees.

Sherburne County Sheriff Joel Brott says the proposed expansion would also build a new kitchen, laundry, booking and interview areas for immigrant detainees.

The county board must approve any jail expansion or new contract with ICE.

It's unclear if or when ICE will move forward with the proposal.