Besides arresting national convener of Hindu Raksha Dal Pinki Choudhary in connection with the attack, police have detained another person in the regard.
"We have arrested an accused for the attack on AAP's office. Police are also scanning footage of CCTV installed at party's office to identify other accused, who would also be arrested soon," Rav Vijay Singh, Deputy Superintendent of Police, told reporters here.
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Earlier in the day, activists of Hindu Raksha Dal attacked Aam Aadmi Party's Kaushambi office.
Around 40 activists of Hindu Raksha Dal broke flower pots kept outside the AAP's office and tore party posters. Some glass doors were also smashed in the attack.
"We are against AAP's leader Prashant Bhusan's remarks on Kashmir. The attack was also instigated by Kejriwal's remarks on Batla encounter," Choudhary told reporters here after his arrest.
Bhushan had recently said a referendum should be carried out in Kashmir to decide on deployment of the army to deal with security threats in the Valley.
Choudhary alleged that another AAP leader had made remarks against Hindu Gods which was not acceptable to them.