In the latest exodus, a Trinamool Congress legislator and 15 councillors of the party in West Bengal joined the BJP on Monday.
A TMC member of a block panchayat Samiti of Khanakul in Hooghly district, Manoranjan Patra, was attacked when he was sitting outside the party office, resulting in his death, police said.
It is alleged that those responsible for the killing of Hossain attacked his home at Kuchiamora village under Domkal police station and murdered the three.
Three persons were killed when a group of miscreants allegedly fired bullets and hurled bombs at them in Domkal's Kuchiyamora village.
The victim was identified as 35-year-old Saraswati Das. She was shot dead by unidentified assailants while she was home alone.
The BJP is adopting the same strategy used by Trinamool supremo and Bengal CM Mamata Banerjee during the 2011 Assembly elections to defeat the Left.
Three people were also severely injured when crude bombs were hurled in Bhatpara; security beefed up, RAF deployed
Though police confirmed the death of Samatul Doloi, whose body was found in a field at Sarpota village under Amta Police Station limits, officers were tight-lipped about the cause of the death.
Banerjee will first pay floral tributes to the leader at a ceremonial programme at the Hare School ground on College street and then would walk on foot from there to the Vidyasagar college.
This is for the first time Governor Keshari Nath Tripathi met the prime minister and the home minister after the Lok Sabha elections.
Situation under control in West Bengal, says Mamata government in reply to Centre's advisory over violence
The chief secretary said the situation is under control and it may not be construed under any circumstance to be a failure on the part of the law enforcement machinery.
The education minister said the party will resist Bharatiya Janata Party's attempts to disrupt peace and harmony in a non-violent manner.
The saffron party won 18 of the 42 Lok Sabha seats in Bengal in the recently-concluded parliamentary polls, only four less than the Mamata Banerjee-led Trinamool Congress's 22.
The deaths took place on Saturday during a clash between workers of the two parties in the city of North 24 Parganas. Removal of party flags had triggered the fight.
Following the death of Ajijar Rahaman, a local TMC leader accused a BJP leader of being complacent to the crime along with his other associates.