Power towers transporting electric power from Marib to Yemen's capital Sana'a came under attack on Sunday, with the Marib gas-fired power station out of commission for a second time in the past two weeks.

The attacks occurred in Nihm district where the army has been fighting tribes for months.

The capital Sana'a was plunged into darkness last night after electricity was cut off at 10:00 pm.

On Thursday and Friday power towers in Bani Al-Harith on the outskirts of Sana'a and in Bani Al-Jadan in Marib sending the station, which supplies almost 40 percent of the country's electricity, out of service.

This year, the station and power towers have been attacked for almost 35 times, according to officials at the Public Electricity Corporation.