[buccaneer81]

For LNG to burn, it must first vaporize, then mix with air in the proper proportions (the flammable range is 5% to 15%), and then be ignited. In the case of a leak, LNG vaporizes rapidly, turning into a gas (methane plus trace gases), and mixing with air. If this mixture is within the flammable range, there is risk of ignition which would create fire and thermal radiation hazards.

[massgopguy]

LNG explodes when it comes into contact with water.

[thackney]

And now that the lighter-than-air gas in a one to ten ratio mixture with ambient temperature air, outside...

Where do you think most of the methane is going to be?