Guards provided by CISF accompanied Rakesh Singh during his travels and they could provide valuable inputs to investigators about the places he used to visit, the official of Kolkata Police said.
Around 10 gm of cocaine was seized from the possession of one person who was picked up from Entally, and another was arrested from the KIT building in the Poddar Court area on Tuesday night.
On February 20, BJP Yuva Morcha leaders Pamela Goswami and Prabir De had been arrested with 100 grams of cocaine from New Alipore in Kolkata.
The woman, who is in her mid-20s, used to work for BJP leader Rakesh Singh, a senior officer of the Kolkata Police said.
The accused, a 42-year-old resident of New Alipore area in the city, is a close associate of Singh and has played a vital role in the drug smuggling case, a senior officer of Kolkata Police said.
With the fresh arrest, six persons, including two BJP leaders have been held so far in connection with the case.
Goswami, who was being taken to the court in connection with the drug seizure case, told reporters that Singh was instrumental in keeping the contraband in her car.
Earlier, Kolkata Police arrested both sons of Rakesh Singh from his residence on the night intervening Tuesday and Wednesday "following their links with Pamela Goswami".
Pamela Goswami, state secretary of the BYJM, was earlier arrested along with a friend and her personal security guard from south Kolkata's New Alipore area in the case.
Bharatiya Janata Yuva Morcha leader Pamela Goswami has accused Singh of hatching a conspiracy to frame her in the case.
Kolkata Police search beauty parlour 'owned' by BJP youth-wing leader Pamela Goswami after drugs haul
Sleuths of the city police took Goswami to the parlour in the New Town area and conducted the search on the premises in her presence, sources said.
Pamela became drug addict under friend's influence: Arrested BJP leader's father tells Kolkata Police
Goswami, a former fashion model and small-time actress, was remanded in police custody till February 25.
Pamela Goswami demanded a probe by the state Criminal Investigation Department (CID) into the incident.
Expressing her doubt, BJP MP Locket Chatterjee said there were many incidents in which our party workers were falsely framed.