At Horseshoe Casino, the Tunica County Sheriff's Office SWAT Team arrived with Brinks Security, armed with machine guns. 'We love to play, but the building was pulling away so you can see the big gaps and the water rising up to the windows,' said casino patron Nashanta Williams. (WMC-TV) - For the first time ever, casinos in Tunica, Mississippi were forced to close their doors Sunday until the rising waters recede.