US regulators reportedly altered official maps of flooding risks to remove many of the buildings at a camp in Texas where 27 children died in severe floods.

Federal regulators repeatedly granted appeals to remove Camp Mystic's buildings from their 100-year flood map, loosening oversight as the camp operated and expanded in a dangerous flood plain in the

There are questions over why oversight was eased at Mystic Camp as it expanded in a hazardous floodplain, the AP reported.