Saw this via Twitter:

BreakingNewsOn At least 10 people have been seriously injured after being shot inside Coleman Federal Prison in Florida, BNO News has learned. (corr. name) about 1 hour agofrom BNO Headquarters

That's the home-away-from-home for one Lord Black of Crossharbour (aka Inmate No. 18330-424), but it's a huge complex, so Black probably didn't get injured.

Update

CNN reports that the shots were fired by prison staff to break up a large-scale fight in the high-security unit. I believe Black is in one of the lower-security units, which weren't affected.

Eight inmates were wounded, one by a prison staffer's bullets. There were seven other shooting/stabbing victims.