Likely mostly gang related and linked to one situation.
That's the reason why the rate is so high right now. Yes there has been a bunch that are gang related but there have also been lots that are just oddball ones. I'd also say a good portion of them are also domestic disputes.
But then there is random stuff like a couple of inmates killing each other at prison and also a couple where the body was found in a previous year but the evidence was found this year that upgraded the dead body to a homicide and it counts in this years numbers.
Most people tend to ignore all these little things though because the Journal, the Sun and other media outlets are just focused on one big number that looks bad and so many people are sensitized by that number and just get attached to it.