This kind of makes me think of the Oakville blobs event. For those who aren't familiar, back in 1994, one day gelatinous blobs rained down on Oakville, Washington and a bunch of people who touched it got sick, some even hospitalized, and pets died that came into contact with it. No one knew what they were and locals were freaked out. Local experts ruled out jellyfish remains and some other popular theories. The government was pretty mum on it and basically didn't offer much other than "We don't know what it is" even though it was making people sick. A couple scooped some of the material up and stored it in a local container and gave the sample to a local scientist who was going to study it in his lab and try to figure out what it was, but it was known they were organic. He thought he was really close to identifying what they were, and when he went back to his lab the staffers told him men with suits came in and confiscated the substance. So he was never able to finish his work.
To this day no one knows what it was and if they do, they aren't saying. One of the most popular online sleuth theories is there's a government agriculture center near town and people think they were either testing some new pesticide substance and dropped it on the wrong location and didn't want to admit wrongdoing. Or, perhaps more sinister, because it rained blobs down on multiple occasions not just once, so that would tend to rule out an accidental mishap, is the government used this small town as guinea pigs to see what would happen if people were exposed to it.
Anyway, any time something weird happens that seems alarming and the government is oddly blase about it, it definitely sends up antennas.