Facility also had no air conditioning for two days amid extreme heat, according to one of the people detained

People detained at an overcrowded federal immigration camp in Mississippi were sickened by a mystery gas leak, then denied medical care when they complained of headaches and other symptoms, it has been alleged.

A lengthy power outage at Adams county detention center, an Immigration and Customs Enforcement (ICE) facility run by the private operator CoreCivic, also left it without air conditioning for two days this week, according to one detainee who contacted the Guardian through his family.

Ben Crump and Rev Al Sharpton, also present at National Association of Black Journalists, demand ‘truth’ and ‘transparency’ in Wells’ case

On Thursday morning, the parents of Nolan Wells, Christine Wells-Wonsley and Elmore Wonsley, along with Ben Crump, the civil rights attorney, and Rev Al Sharpton, the famed civil rights activist, spoke at the National Association of Black Journalists (NABJ) convention in Atlanta. Wells was an 18-year-old college student who was found dead on 6 July after a boating trip with friends, and his death captured national attention.

Wells went missing on 4 July and a photo of the teen, who was Black, and his three friends on the trip, who were white, went viral. Social media users have speculated that Wells’s disappearance, death and the perceived lack of urgency in the county’s investigation into what happened to the teen are because of his race.