Reports filtering in suggest Jamaica's 100 and 200 metres world champion has been poisoned.
Usain Bolt is said to have complained of pains in his tummy and when doctors in Rio checked him out and took a blood sample, they found low levels of Arsenic (poisonous substance).
The global icon is said to have vomited and requested to be sent back to Jamaica.
Arsenic in contaminated water used for drinking, food preparation and irrigation of food crops poses the greatest threat to public health.
Athletes and journalists who have already arrived in Brazil were quick to share their concerns about the questionable lodgings, with problems ranging from collapsed sinks and flooding to no electricity in the rooms.