Mexico's state oil firm, Pemex, did not close the valve at a leaking gasoline pipeline when first notified because it was not initially thought to be an "important" leak, Mexico's security minister said on Sunday.

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The pipeline in central Mexico exploded on Friday, leaving several people dead who were collecting gasoline at the leak, officials said. 

Security Minister Alfonso Durazo told a news conference that Mexico's military detected the leak about four hours before Pemex closed the valve. 

The number of people who have died from the gasoline pipeline explosion in central Mexico has risen to 85, Mexico's health minister said on Sunday.

An additional 58 people were hospitalized, Health Minister Jorge Alcocer told a news conference. 

The explosion took place when about 800 people in Hidalgo state's Tlahuelilpan district were collecting fuel from a leak at a major pipeline.