"I strongly condemn the attack on AAP office," Singh wrote on micro-blogging website Twitter last night.
Activists of a fringe right-wing group had yesterday attacked and vandalised the AAP office at Kaushambi in Uttar Pradesh's Ghaziabad district protesting the controversial remarks of its senior leader Prashant Bhushan on the presence of security forces in Jammu and Kashmir.
"BJP as usual has dissociated itself from the attack and it was part of their strategy," he alleged.
"Doesn't it remind of the character in the Ramayana who had 10 faces and one body?" he asked.
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Armed with sticks and bricks, about 40 activists of Hindu Raksha Dal had stormed the AAP office near the residence of Delhi Chief Minister Arvind Kejriwal and broke the door panes and flower pots in its front-yard.
Bhushan, who is under fire for his remarks on Kashmir, blamed the BJP and RSS-affiliated organisations for the attack on the party office, saying they were "extremely frustrated with the rise of AAP".