Thieves have stolen nearly $250m (£165m) of petrol from a single pipeline this year, Nigeria's state oil company says.
The Nigerian National Petroleum Corporation (NNPC) said half a billion litres were taken from the pipeline that runs north-east from Lagos.
Long queues have formed at petrol stations across Nigeria in recent days.
Governments blame pipeline vandalism and theft in the oil sector for fuel shortages and damaging the economy.
An NNPC subsidiary told a Senate committee that "incessant hacking" of the System 2B pipeline had "made the task of providing seamless flow of petroleum products to retail outlets more burdensome".
The pipeline stretches 250km from the financial hub Lagos to the city of Ilorin.