They discovered a haze and damaged glass, the division stated. There was no signal of fireplace.
The haze and the minor harm, together with what gave the impression to be a small indentation within the floor, appeared to counsel one thing on the order of a reasonably large amount of fireworks, probably with extra explosive energy than in a regular firecracker or two.
Hearth investigators had been known as to the scene, however the matter appeared one for legislation enforcement, the division stated.
Excessive-rise buildings close by apparently created an echo chamber and amplifier for the sound of the blast. Reviews on social media indicated that it was heard as distant as tenth Avenue and Maryland Avenue in Northeast.
One individual tweeted that from a apartment nearer to RFK Stadium than to Nationals Park it seemed like thunder on a rainless evening. One other individual on Twitter reported listening to it on the east facet of the Anacostia River.
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