Ilado, Nigeria ? Gasoline gushing from a ruptured pipeline exploded Friday as villagers scavenged for fuel, setting off an inferno that killed up to 200 and left charred bodies scattered around the site in this oil-rich country of mostly poor people.

Grim-faced rescue workers swung corpses into a mass grave as dozens of other scorched bodies awaited collection. It appeared some victims tried to flee the unfolding disaster only to be overtaken by flames spreading across the fuel slick.

The stark outlines of white skeletons lay against a beach charred black by fire. Other bodies floated alongside dozens of plastic jerrycans in the nearby waters of the coastal mangrove swamp. The jerrycans, which had contained pilfered gas, were twisted by the heat of the explosion.

More than 1,000 people in Nigeria, Africa’s oil giant, have died in recent years when fuel they were pilfering from pipelines caught fire – and officials said it would likely happen again.

“Because this thing has happened many times before, we thought it would be a deterrent, but apparently it wasn’t enough deterrent for these people who died,” said Lagos State Health Commissioner Tola Kasali, surveying the scene near Ilado, about 30 miles east of the main city of Lagos.

“Anywhere you have a pipeline in this country, you have this problem because people are greedy and they want quick money,” Kasali said.

It was not known what set off the fire. An FBI official in Washington said the bureau was working on the case but did not explain whether foul play was suspected. The FBI often gets involved in criminal investigations abroad when Americans are involved or when asked by the host country.

Police and rescue workers said villagers were collecting the gushing gas when the fuel ignited, and Lagos Police Commissioner Emmanuel Adebayo said 150 to 200 people died. The Red Cross had said it was treating survivors, but no live victims were seen.

By day’s end, about 100 of the dead had been interred, and Kasali said cleanup efforts would resume today.

He said the uncollected bodies pose a health risk to the millions of inhabitants of Lagos, whose skyline could be seen on the horizon.

“We just decided to give them a mass burial because no one can recognize them – even their family members can’t identify them,” he said. “We’re concerned that if we don’t do that, we’ll create a health emergency in Lagos since it happened by the shore and the water will just flow back into the city.”