According to a volunteer, the vandals entered the second floor at Chakala and tore and burnt the poster of Arvind Kejriwal. “They threw black ink bottles all over.”
NCP spokesperson Nawab Malik said the party was "seeking the details of the incident".
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The AAP will file a First Information Report in connection with the attack and also file to the police the CCTV footage at its office, he added.
Police sources said the group had entered the AAP office at around 2:30 pm.
The alleged attack comes two days after AAP leader Anjali Damania attacked Maharashtra Deputy Chief Minister Ajit Pawar saying that Mumbaikars were paying high electricity bills due to corruption and the inefficiency of the state power ministry and the distribution companies.
"In the past three years, due to corruption, mismanagement and inefficiency of the state power department, Maharashtra has incurred losses of up to Rs 22,000 crore," the AAP leader had alleged.