A journalist thinks they might have been filming an ad.
There's speculation this CBP pony show is actually for a DHS ad and not a sweep, given how few bystanders appear to be around and the presence of internal press people. If so, that requires a permit. I've reached out to the LA film permitting office to see if DHS has one.
https://bsky.app/profile/marisakabas.bsky.social/post/3ltfewz3nfk2l
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Edit
It was over quickly considering what a massive show of force they made. Also - they didn't seem to make any arrests.