Server-side adjustment has been applied to the North American game-server earlier today (July 5th). The adjustment has been connected with team killing and team damaging.
One will get team killer statuses quicker now (the amount of credits subtracted as penalty has not been changed, but one can get banned for TK more easily). Penalty rates for "splash" damage remain the same.
The update was server-side. The game client does not require any updating.