Another sad, but excellent, example of how things can go from bad to worse in seconds when dealing with HAZMATs with high vapor pressures and low MIE(s)! This was a LPG tanker that hit a tunnel entry embankment; FD was on the scene when the tanker leak got considerably worse (as can be seen in the video). The vapor cloud found an ignition source and a massive explosion resulted. In the first video angle you can actually see the blast wave moving through the air; in the second video you can how fast the vapor cloud engulfs everything in the immediate vicinity, including several fire trucks (which ended up being casualties of this incident). The incident occurred in China so the facts surrounding what actually happened is sketchy, but most news accounts state that there were five (5) fatalities; 3 firefighters and 2 civilians.