The US Virgin Islands' power company has reported a complete electricity outage in St John and St Thomas, which is the US territory's most populated island.
Officials said the outage occurred late on Thursday when a key power plant lost all generation capacity for unknown reasons.
The Virgin Islands Water & Power Authority said it did not know when power would be restored.
More than 51,600 people live in St Thomas and more than 4000 people live in St John.
Australian Associated Press