Widespread power outages have struck Turkey, with rail networks and air traffic radars crippled.
The nation is facing the worst event of its kind in 15 years. The possibility of a terrorist attack is being investigated.
The outage was confirmed in some 23 provinces, including Ankara and Istanbul. Later information from Broadcaster NTV put the number at 40. An energy official at the ministry has offered no immediate comment, while the power supplier TEIAS likewise did not respond to questions.
The subway system is at a standstill and flights across the country have also suffered setbacks.