Police on Wednesday also said the incident was not connected to a case involving a reputed gang killing in India, The Fresno Bee newspaper reported.
Rebel Akali leader Gurpartap Singh Wadala slammed Badal's move, saying instead of showing "a sense of renunciation", he issued a "dictatorial order" aimed to sideline those who want a "change" for strengthening the party
However, there is no official confirmation on Brar's detention yet, Punjab Police officials said on Friday.
In a notification, the Union home ministry said Brar, backed by a Pakistan-based agency, has been involved in multiple killings and professes radical ideology.
The rebel leaders met in Jalandhar when SAD chief Badal was holding a meeting with the district presidents and other leaders in Chandigarh to review the party's performance in the Lok Sabha polls.
Pritam Singh, a resident of Akkanwali village of Mansa district, consumed the poisonous substance Friday morning and died at a hospital later in the day, they said.
The Punjab police had sought the red corner notice against Brar on May 30 in connection with two old cases, officials said.
Badal's mortal remains were taken to the family's farmland, around a kilometer from his residence, on a flower-decked tractor-trolley with his son Sukhbir Singh Badal and other family members standing with folded hands as the vehicle moved past the mourners on the route.
The Shiromani Akali Dal had on Saturday quit the National Democratic Alliance over the farm bills issue.
Security forces in Amritsar and other areas of the state have been asked to remain on alert ahead of the 31st anniversary of Operation Bluestar on Saurday.
Take a look at the famous faces who exercised their democratic right.
This classification of districts is to be followed by states and union terrotories till a week post May 3, when the second phase of lockdown will end, for containment operations.