Sometimes when you are injured and your property is damaged, you may not know the identity of the culprit. But just because the person responsible is unknown doesn't mean you can't sue.
The American legal system is actually set up to handle lawsuits where many (or all) of the defendants' identities are a mystery. It may make your case less likely to be a success, but not knowing a name or address isn't a fatal blow to a civil lawsuit.
So how can you still sue if you don't know who injured you?