I initially read that there was no casualties just a damaged car and injures but now I read again that two people passed away.
Where did you read that from? It is in the OP that two people were killed, but we do not know who they are until few minutes ago that BBC confirmed who they are.
BBC has confirmed the people that were killed, they are Sina Ghami and Latif "Latz" Ayodele, his promoter Matchroom Boxing has confirmed.

May their souls rest in peace.
I am not doubting that people died, I have done a research and Anthony Joshua lost two of his friend and one was also his fitness coach, but very early news I read said that there was no casualties, it does not matter because the truth is he lost two friends and was injured mildly.