Half a dozen manholes have exploded in Rio de Janeiro's showcase Copacabana beach neighbourhood.
No injuries were reported from the explosions, caused when accumulated underground gas tossed the heavy metal lids several metres into the air.
Joao Barros, who witnessed the explosions, said they "sounded like dynamite". He said smoke billowed out of some of the manholes.
Firefighters and technicians have cordoned off the area. Utility officials said there was a short circuit in the area.
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