Kolkata: Bihar gangster Tausif Raza, alias Badsha, and his cousin, Nishu Khan, have been coming to Kolkata regularly since 2023, a probe by Bihar STF and Kolkata STF has found. Arrested for murdering another Bihar-based gangster, Chandan Mishra, at the Paras Hospital in Patna along with two others, the cousins stayed in Kolkata for over two weeks last year.“We have identified several locals with whom they were in touch, and we are questioning all of them. We will also be keeping a check on their activities from now on. These contacts do not stay at either New Town or Anandapur,” said a source in Kolkata STF.“The cousins loved staying at hotels and partying in bars. It was during these bar visits that Nishu became acquainted with individuals involved in Kolkata’s criminal underworld. After being shot in the spine during a gunfight with Bihar police, Nishu supplied weapons to criminals for some time. We suspect he might have supplied arms to some criminals in North 24 Parganas and Kolkata too during this time,” claimed Bihar police sources.Investigators are trying to determine who they contacted by tracing their mobile phones. Meanwhile, the four accused, for whom Bihar police received a 48-hour transit remand, set out for Patna around 11 pm on Sunday, reaching Patna in less than 12 hours. Three vehicles took the accused back, the first one carrying the injured Nishu (recovering from an unrelated bullet injury) and the next one taking back the three other accused to Patna.According to information received by Bihar Police, it was mainly Nishu who built a strong network in areas like Topsia, Tiljala, and Park Circus. He recruited his own men there, who helped by providing various logistics after his operations in Bihar as instructed by Nishu. Nishu often returned to the city afterwards.The probe also revealed that it was Tausif who drove to Kolkata via Gaya. Cops found CCTV footage of the Bihar number plate SUV entering the city after losing its track from Ruby crossing. Some social media exchanges between Nishu and a woman revealed the gang members were looking for a house on rent in the Anandapur area. The CCTV of the area was tracked minutely, and the vehicle was tracked yet again, making it easier for investigators to carry out the arrests.According to police, Nishu’s friend booked a room in her own name on the third floor of the Anandapur guest house through a local acquaintance. It was there that Kolkata Police’s STF detectives apprehended Tausif, Nishu, and Harsh Kumar. The police said that Nishu’s female friend was released as she was not involved in any crime.However, Bihar Police are also questioning several others besides the detainees, given at least four other shooters are still at large. They have been trying to find out why Nishu and Tausif came to Kolkata after the crime at the Patna hospital. They said that they might soon move court to question Sheru Singh, who is imprisoned in Purulia jail and widely claimed to have instructed Tausif to murder Chandan. It is reported that Sheru even provides them with monthly payments.