[Question] Ways to organize a search for a missing person in LA from abroad?

TL/​DR: My father-in-law is missing, asking for help/​advice in coordinating search from abroad

This is not the thing I hoped I would post here after years of lurking, but situation is rather extreme and I try to get all the help I could get.

My father-in-law, Igor, has gone missing in LA after the stroke; because of his medical condition he is confused and unable to use his phone. He doesn’t have any friends or relatives in the US, his English is not very good (he is Ukrainian and only moved to LA last year), and he doesn’t have a place to go to – his landlord has evicted him from the apartment he rented when Igor was admitted to the hospital.

My wife and I live in Georgia (the country, not the state), and we try to organize a search for him from abroad; we can’t come to the US.

So the question is – what would be the recommended course of action to coordinate the search for a missing person from abroad? We have filed a missing person report to the police, we post to Facebook groups and made a simple website with basic information – what could be our other options?