A BBC Africa Eye investigation has exposed the cause of the explosion which occurred at Abule Ado in Amuwo Odofin local government area of Lagos state.

In March, about 23 people were killed and more than 50 houses were destroyed when a massive explosion hit the area.

Among those who lost their lives were a family of four and Henrietta Alokha, an administrator at Bethlehem Girls High School, a Catholic-owned school where at least 60 students sustained injuries from the incident.

The Nigerian National Petroleum Corporation (NNPC) had attributed the explosion to gas cylinders hit by a truck in the area where NNPC has its pipelines.

But in a 17-minute forensic investigation released on Monday, BBC Africa Eye faulted NNPC’s explanation on the cause of the blast that decimated over 100,000 square metres of the city.

The video documentary showed how a leak of vapourised flammable liquid from an NNPC pipeline ignited and caused the explosion.

The investigation revealed that the NNPC pipeline was not maintained and protected.

When the BBC approached NNPC with its findings, the agency again denied complicity and maintained its earlier stand that a truck hit gas cylinders at an LPG shop.

The NNPC had said the pipelines are strictly compliant with safety and regulatory guidelines, insisting that there was no leakage prior to the explosion.

Babajide Sanwo-Olu, governor of Lagos state, had announced that a N2 billion relief fund had been set up for victims of the explosion.

He also announced that a committee had been set up to investigate the explosion.