Human VS LPG (human problem)

A 50-kilogram liquid petroleum gas (LPG) canister at a Pizza Hut Delivery (PHD) outlet in Jatimurni, Bekasi, West Java, exploded early Sunday morning, injuring two people and damaging four buildings.
The canister exploded inside the three-story PHD outlet, Jakarta Police spokesman Sr. Comr Awi Setiyono said as reported by kompas.com. The explosion completely destroyed the PHD building and caused severe damage to three other buildings near it, including an Alfa Midi minimarket.According to Alfa Midi employees, the explosion took place at 7:20 a.m., Awi said, adding that there were no fatalities.

Meanwhile, Pondok Cabe Police chief Comr. Sukadi said the police were investigating the cause of the explosion and had secured the scene. A fritter seller and a child in the vicinity were injured in the blast, he said. The fast food employees had returned home at 11 PM so the restaurant had been emptied.

I think there are two situations where this will usually happen, the first is that something physically punctures the tank, the second is the tank becomes so hot that the pressure of the gas inside it ruptures it from within.
The general safety procedures to prevent at propane tank from exploding are not to puncture it, and to keep it cool, as in below 120F. Still, propane cylinders are not easy to explode. In a situation where flames are impinging on the vapor space of the cylinder and the metal gets near melting, the cylinder will rupture violently.
 
Reflection based on http://www.thejakartapost.com/news/2016/10/23/lpg-explosion-in-pizza-hut-outlet-destroys-four-buildings.html