I don't think that info is in the public domain yet
One of them was shot and three of them were subject to "medical emergencies" according to the radio today. That could mean anything though
The woman who was shot was attempting to climb through a window (part of an inside door) she'd just broken. I don't know anything about the other three deaths.
As I understand it, three of the deaths were apparently a result of medical emergencies so stroke, heart attack and so on. The third woman was shot as she attempted to break into the hall, there were two armed guards just inside the door with handguns.
if you think about it this horrible episode has shown that trump has a small army of people quite willing to risk life and injury for him - loyal to him personally and not the country... many of them have military training and are armed to the teeth. If he is not punished then what is to stop him trying something worse? Can they be stopped? A frightening prospect. What on earth did they unleash when they elected him in the first place.