Gov. Gretchen Whitmer said Sunday evening that the Michigan Gaming Control Board will temporarily shut down state-regulated casinos in Detroit while the number of confirmed coronavirus cases in the state climbed to 53.

The new cases include five people from Oakland County, including a male child; three people in Detroit; three in Macomb County, and two in Wayne County.

As for closing Detroit's three casinos, "we know that's where there are masses of people who congregate," Whitmer said.

Across the Detroit River, Caesars Windsor also temporarily closed early Monday morning. The shutdown began with the closure of the gaming floor at 4 a.m. Monday and hotel guests will depart by noon, the casino and hotel said in a statement. Upcoming concerts are also being postponed.

MGM Grand Detroit will suspend operations at 5 p.m. Monday in its casino, hotel, restaurant and bars for two weeks, "at which time the status will be re-evaluated," MGM Resorts Chief Operating Officer and President Bill Hornbuckle said in a statement posted on the casino's Twitter page.

"As we continue to navigate through this unprecedented public health crisis, we will close for the safety of our employees and the community," Hornbuckle said in a statement released by MGM Resorts International (NYSE: MGM).

Greektown Casino-Hotel also plans to suspend casino operations at 5 p.m. Monday, according to its parent company, Wyomissing, Pa.-based Penn National Gaming (NASDAQ: PENN).

Jay Snowden, president and CEO of Penn National Gaming, said late Sunday that Greektown would continue to pay the wages and benefits of its nearly 1,650 employees during the two-week shutdown.

"This is a challenging time for all of us, and we are very appreciative of the overwhelming support and understanding from our guests and team members," Snowden said in a statement. "We look forward to reopening our doors just as soon as possible.

The Marian Ilitch-owned MotorCity Casino Hotel plans to close its gambling floor at noon Monday for 14 days, but will keep its hotel open, according to a post on the casino's website.

A spokeswoman for the Michigan Gaming Control Board had no immediate details Sunday evening about the shutdowns.

The temporary closures do not apply to tribal casinos as the state gaming control board has no direct regulatory authority over those gambling halls. However, Gun Lake Casino announced Sunday it would voluntarily close its Allegan County tribal casino for two weeks, starting at 3 a.m. Monday.

MotorCity constructed temporary walls to divide the gambling floor in an effort to keep parts of the building within Whitmer's executive order Friday banning gatherings of more than 250 people.

The governor announced the temporary casino closures during a news conference in Lansing, where she said the state's testing labs had confirmed 12 new cases of the coronavirus disease in Michigan. Late Sunday night the state confirmed a total of 20 more from Saturday's case count, bringing the new total to 53.