A TOTAL of 140 million people have been plunged into darkness in the world’s biggest blackout. The massive blackout happened due to a mysterious grid failure in Bangladesh, the government’s power utility company said. AP140 people were left without power[/caption] Bangladesh has suffered a major power crisis in recent months as a result of higher global energy prices following Russia’s invasion of Ukraine and has imposed regular cuts to conserve electricity. But it remained unclear what caused Tuesday’s unscheduled blackout, which hit more than 80 per cent of the country shortly after 2pm (8.00 GMT), according to the Power Development Board. Apart from some locations in Bangladesh’s northwest, “the rest of the country is without power”, spokesman Shamim Ahsan said. The normally brightly lit streets of central Dhaka and other cities were dark on Tuesday evening. It remains unclear what caused the outage with Ahsan alleging it was caused by a technical malfunction. He said: “It is still under investigation.”