It may be a search warrant but it surely is not an interview. His lawyer would be there in that case. It could be because of the trespassers but they would have dispersed that crowd right away. But wouldn't a search warrant involve more agents with boxes, cameras, all sorts of stuff. Would they stop by to provide an update on the investigation? Maybe. Hopefully we'll know soon enough.
And here’s the downside to an out of state lawyer!