Secretary of the trust, S K Mukerjee said that he would report the matter to the police for further legal action against the AAP activists.
Meanwhile, Kejriwal has described the incident as "highly unfortunate" and assured that the party will take care to avoid such incidents in future.
Mukerjee alleged that "the AAP activists barged into the office and organised press conference without requisite permission."
The Jallianwalla Bagh office property was also damaged in the melee, he claimed.
During the press conference, heated words were also exchanged between media persons and AAP activists on some issue, sources said, adding that a scuffle also ensued after the verbal duel.
Amritsar Press Association president Jasbir Singh Patti was also allegedly manhandled.