The World Anti-Doping Agency has stopped its accredited laboratory in Rio de Janeiro from conducting tests just weeks before the Olympic Games open in the city.
WADA says the lab's accreditation has been suspended due to "non-conformity with the International Standard for Laboratories." The suspension prohibits the laboratory from carrying out all anti-doping analyses on urine and blood samples, the world doping watchdog said in a statement.
No details of the laboratory's failings were specified. It may appeal the decision to the Court for Arbitration for sports within 21 days.
WADA's incoming director general Olivier Niggli says the agency "will work closely with the Rio Laboratory to resolve the identified issue."