Zargar, who is an MPhil student of Jamia Millia Islamia University, is now in the custody of Delhi Police Special Cell
The ruling AAP had then suspended him for alleged involvement in the violence which has left at least 53 people dead and around 200 injured.
The accused have been identified as Feroz, Javed, Gulfam and Shoaib from Chand Bagh area and Anas from Mustafabad, they said.
He said Delhi riots were a conspiracy and no one responsible will be spared irrespective of his party, religion or caste
A 33-year-old Mohd Danish, was sent to four-day police remand on Monday by a Delhi court after the police said his custodial interrogation was required to unearth a "larger conspiracy".
Participating in a discussion in Lok Sabha on the Delhi violence, he urged Hindus to "save the soul" of the country and claimed that around 1,100 Muslims are under illegal detention.
The home minister claimed that more than 300 people from Uttar Pradesh came to Delhi to incite violence
Police data shows the number of illegal firearms confiscated in the Capital has doubled in just one year from 2017 to 2018
Initiating the discussion, Congress leader in Lok Sabha Chowdhury said while some claimed Hindus won, the others said Muslims won in the violence.
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The police team submitted the report to the Home Minister in his chamber in Parliament hours before the government was to begin the most demanded discussion
The officials said the federal agency has taken cognisance of a clutch of FIRs filed by Delhi Police's Crime Branch to probe the alleged money laundering
Amit Shah defending the Delhi Police said that over 700 FIRs have been lodged over the violence and special public prosectors have been appointed
The government had agreed to hold the discussion after Holi, when the "normalcy" returns
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The government had said last week to repeated demands of opposition that it is prepared for it on March 11 after Holi in Lok Sabha and on March 12 in the Rajya Sabha
He was presented before a duty Metropolitan Magistrate on expiry of his three-day custody previously
The women, staging the protest for nearly three months, said the support is encouraging
Total 262 meetings with the Aman Committee have been conducted across the national capital, a senior police officer said.
Police have registered a case against him under relevant sections of the Indian Penal Code (IPC) and the Arms Act. His four-day police custody ended on Saturday, officials said.