Mexican authorities now put the number killed in Friday night's fuel pipeline blast at 66, with scores more injured.
It is believed the explosion occurred after the line was ruptured by suspected fuel thieves in the town of Tlahuelilpan, in Hidalgo state.
Officials say scores of people had been scrambling to fill up containers and were engulfed in an inferno.
Dozens of charred bodies remain at the scene, which is cordoned off by security forces.
Local people said President Andrés Manuel López Obrador's new policy to crack down on fuel theft had created shortages.
"Everyone came to see if they could get a bit of gasoline for their car," farmer Isaias Garcia told Reuters news agency. "There isn't any in petrol stations."
The new death toll was announced delivered by Hidalgo state governor Omar Fayad in a briefing alongside the president.
Among the 76 injured were three women and a child of 12, Mr Fayad said.
Distraught relatives continued to gather at site of the explosion.
Forensic experts have been photographing remains amid a backdrop of burned clothing and discarded fuel buckets.