A breakdown in Pakistan's national power grid plunged the country into darkness on Saturday night, officials said.
"A countrywide blackout has been caused by a sudden plunge in the frequency in the power transmission system," Pakistan's Power Minister Omar Ayub Khan said on Twitter.
He said efforts were underway to determine the reasons behind the situation, and asked people across the country to remain calm.


Hope for progress after US, Iran hold first shuttle talks in months
Philippine Senate lowers threshold for conviction in VP Duterte's impeachment trial
Pakistan tightens security ahead of march planned by Imran Khan's party
Search continues after death toll from capsized Indonesia ship rises to 20
Trump urges compete isolation of Iran, expects deal after election
