The 4 people arrested have been identified as Sagar Sharma, Manaoranjan, Neelam, and Amol Shinde.
Sagar Sharma, son of Shankarlal Sharma, who hurled the gas canister in the Lok Sabha reportedly got the visitor pass from BJP MP Pratap Simha.
35-year-old D Manoranjan, son of D Devaraj, who is from Mysuru was also detained from inside the Parliament.
Delhi Police has detained Neelam from outside Transport Bhawan. The 42-year-old woman is reportedly from Hisar.
25-year-old Amol Shinde who is from Latur was also caught outside Transport Bhawan