"Missing People" after this attack?

I wondered after this Manchester thing that was far bigger and will have had more drastic injuries ... how is it taking them so long to put the relatives of "missing people" with the victims, and now it's the same thing with this London attack?

It's not like there are 100s involved. Pretty much everyone in the country must be aware now of like the Spanish guy who fought with a skateboard and missing Australian woman and so on. Why the + are relatives stilll apparently in the dark and having to push and beg for info? It's now 3 days later, for gods sake. How hard can it be to organise these things quickly and efficiently. Is nobody in the authorities watching the news? It appears totally ridiculous that as a country we can't sort out something that seems so simple more quickly, and they are "missing"?