Aggression
Aggression
Commiting a hostile act starts the aggression counter. The aggression counter defaults to 15 minutes and during that time, you and involved parties will be left to fend for yourselves without CONCORD interfering.
Aggression can be caused by stealing, supporting aggressors or through unprovoked attacks.
Stealing
If someone steals items from your can, they are considered fair game and gets a red background (assuming you have the default settings), meaning that they can be shot at by any of the members of the victim's corporation.
Do note that at this point it still counts as an unprovoked attack if they shoot at you. The choice is yours to initiate aggression or not, which is almost always what the instigator wants you to do, to allow him to fight you. See can-flipping for more details.
Should you or any member of your corporation decide to engage in combat with thief, normal rules of aggression applies and CONCORD will stay out of it.
Supporting aggressors
If you remote repair an aggressor or in any other way, directly aids them, the aggression is passed down to you as well. Which means that the one fighting your friend, and members of his corporation, can shoot you without interference from CONCORD.
Unprovoked attacks
Anyone who does an unprovoked attack in high-sec gets aggression from CONCORD. They will show up in a few seconds or longer (pending on the security status of the system) and disable and then blow the aggressor up.
If the aggressor undocks in a new ship for the duration of that aggression (the usual 15 minutes), CONCORD will promptly blow that ship up as well.
If there are several aggressors, a small fleet of CONCORD-ships will spawn for each aggressor, targetting them with webs, neutralizers and scramblers to render them harmless and eventually destroy them. This means that a group of people engaging in unprovoked attacks on a target will not buy themselves more time by increasing their numbers. They will however still do more damage due to their increased numbers, but CONCORD's responsetime to each and every one of them will be the same as if they had been alone.
