ABUJA, Nigeria (AP) — Nigerians were queuing for hours to buy fuel across major cities on Tuesday as the West African nation struggled with its latest fuel shortage, causing more hardship for millions already struggling in an economic crisis.

The fuel shortage has led to an increase in transportation costs in the country where many people rely on public transportation. Authorities blamed the shortage on supply disruptions due to logistical challenges. Queues leading to gas stations stretched up to 3 kilometers (1.8 miles) in some cities including the national capital, Abuja.

Nigeria is one of Africa’s top crude oil producers, but gasoline shortages are commonplace, mostly as a result of frequent strikes and supply disruptions. As on previous occasions, Nigeria’s state oil firm accused fuel companies of exploiting the current situation to maximize profit.