Is that not what is happening? They may just have less information because it is night and harder to get a direct visual on the object. The whitehouse briefing suggests more but I don't think it is wrong for them to take some time to answer to the public. I'd rather a slower and thought out response than a quick one with misleading information. You can see in the public responses that people respond with stupid statements either way. Compare this thread to the one earlier today about Canada, the one yesterday, the big balloon, or even the UFO thread. Conspiracies and armchair experts abound just creating noise. The reuters article, your comment, and the tweet in the parent all seem within a few hours of the actual event. Let's take a breath before we grab pitchforks. If they don't answer in a day or two then I'll be happy to grab my pitchfork too, but some pause is good.

Edit: another user posted a twitter link to someone claiming they saw the object. This does not look like a balloon and I completely can understand why there is a slower response here (I have no reason to distrust this twitter user) https://twitter.com/0rangeandwhite/status/162460072656239001...