A series of massive explosions have destroyed a fireworks market outside Mexico City, killing at least 31 people, injuring dozens and leaving the market a charred wasteland.  Television images showed a flurry of multicoloured pyrotechnics exploding into the early afternoon sky as a giant plume of smoke rose above the market. Fireworks detonated in a peal of clattering bursts reminiscent of a war zone.  It was the third time in just over a decade that explosions have hit the popular San Pablito market in Tultepec, about 32km north of Mexico City. The detonations struck in the run-up to the busy Christmas holiday, when many Mexicans stock up on fireworks.  "People were crying everywhere and desperately running in all directions," said 20-year-old witness Cesar Carmona.  Some children suffered burns to more than 90 per cent of their bodies and were being sent to the US city of Galveston in Texas for treatment, said Eruviel Avila, the governor of the State of Mexico in which Tultepec is located.  He also vowed to find and punish those responsible and to provide economic assistance to those who had lost their livelihoods.  The federal attorney general's office opened an investigation, saying in a statement that six separate blasts caused the destruction.  Isidro Sanchez, the head of Tultepec emergency services, said earlier that a lack of safety measures was the likely cause of the blasts.  The federal police said a forensic team had been sent to investigate and that at least 70 people had been injured. Videos from the scene showed people frantically fleeing, while aerial footage revealed blackened stalls and a flattened tangle of metal and wood.  The state's top prosecutor raised the death toll late on Tuesday to 31, most of whom died at the market.  More than 80 per cent of the 300 stalls at the market were destroyed by the explosions, said state official Jose Manzur.  He said the market was inspected by safety officials last month and no irregularities were found.  Mexican media reported there were 300 tonnes of fireworks at the market at the time of the explosions.  The San Pablito market was heavily damaged by similar fires in September 2005, when a chain of explosions just before Mexico's independence day celebrations injured dozens of people.  © Nine Digital Pty Ltd 2016
At least 60 people have been injured in an explosion at a fireworks market in Mexico, according to reports.&nbsp; &nbsp;