The two AAP legislators, Nitin Tyagi and Rajesh Rishi, were summoned for questioning at Civil Lines police station by 4pm.
"They did not turn up. We will summon them afresh and if they do not come, we will seek help of the court to ensure their questioning," said Harendra Kumar Singh, additional DCP(north).
Police said Laxmi Nagar MLA Tyagi claimed he was in Kolkata and sought a week's time to present himself for questioning. Rishi, the MLA from Janakpuri, claimed he was unable to visit the police station as he was ill.
Eleven MLAs, apart from Kejriwal, his adviser V K Jain and Deputy Chief Minister Manish Sisodia, were present during the meeting at Kejriwal's residence when Prakash was allegedly attacked.
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Two other AAP MLAs - Amanatullah Khan and Prakash Jarwal - were arrested and are now in judicial custody in connection with the case.
The alleged assault on the chief secretary has triggered a bitter tussle between the Delhi government and its bureaucracy.
Deputy Chief Minister Sisodia yesterday accused Lt Governor Anil Baijal of siding with the government officers.
In a terse letter to Baijal, Sisodia equated the IAS officers' association with a "khaap panchyat" and attacked him for "backing" its "fatwa" to boycott official meetings with AAP ministers.
The officers have boycotted meetings with AAP ministers since the attack and Baijal has asked Kejriwal to reach out to the officers and end the row.
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