Referee Stefan Johanesson ordered both teams into the dressing rooms in the 74th minute after Hammarby player Louay Chanko was struck by objects thrown onto the pitch by AIK supporters as he prepared to take a corner.
In the aftermath of the incident, AIK coach Richard Norling issued a plea for calm via the Råsunda stadium loudspeaker system.
Hammarby had taken the lead six minutes before the stoppage following a perfectly placed free kick by Chanko.
After a fifteen minute break the referee eventually allowed the game to continue.
Jorge Ortiz equalized for AIK with an injury time penalty.