The current BBC report states that 270 strikers have been charged with the murders of the 34 shot dead.
That might be confused reporting, but at the moment that's what it says.
If this is about the 10 dead in other (I think separate) incidents it's still pretty
to charge 270 with murder. Riot, etc, yes, but murder? For the whole group? Including those the prosecutor states were unarmed?
I remember when this offence was brought in, and used to charge a much smaller group. It was considered outrageous then, because members of the crowd have no control over what other members do.