Kumar and another MLA Ajay Dutt were summoned for questioning yesterday. Dutt did not turn up as he was in Bangalore. He said he will come for questioning on Monday, the police said.
Kumar, the Jangpura MLA, arrived at the Civil Lines police station at around 4pm and was questioned till 9pm, said Harendra Kumar Singh, additional deputy commissioner of police (north).
The MLA's role in the case is under investigation as he was present at Chief Minister Arvind Kejriwal's residence, when the alleged assault took place on the night of February 19.
Eleven MLAs, apart from Kejriwal, his adviser V K Jain and Deputy Chief Minister Manish Sisodia, were present during the meeting when Prakash was allegedly attacked.
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On February 23, a police team examined the CCTV surveillance system installed at the chief minister's residence in Civil Lines area and seized the hard disc; the forensic report is still awaited.
Two other AAP MLAs - Amanatullah Khan and Prakash Jarwal - were arrested in the case. A city court today extended by 14 days the judicial custody of Khan and Jarwal.
The alleged assault on the chief secretary has triggered a bitter tussle between the Delhi government and its bureaucracy.