Six CPI(M) workers were arrested on Thursday night in connection with the brutal murder of a 27-year-old RSS worker in poll-bound Kerala's Kannur district, from where two incidents of bombs being hurled were also reported on Thursday.
Police said the arrests were recorded late Thursday night.
Those arrested are - Srijayan, Joy Joseph, Prasanth, Prabesh, Libin and Akash, all hail from the district.
The police said a 20-member gang was involved in the attack on Sujit, carried out on Monday night.
The CPI(M) workers had barged into the house of Sujit at Papinesseri in the district and brutally hacked him in front of his aged parents and brother, who also suffered injuries.
Sujit later succumbed to injuries.
While BJP had slammed CPI-M for the attack, the Marxist party had denied it saying it was the fallout of a local incident relating to insulting a girl.
BJP had maintained that CPI(M) was behind the attack to get over the embarrassment of the arrest of its party district secretary, P Jayarajan, an accused in the murder of a BJP functionary in 2014.
The violence comes after a lull in Kannur, which frequently witnessed clashes between CPI-M and BJP.
On Thursday morning, country bombs were hurled at an RSS seva kendra and at the house of a BJP worker in Thalassery in the district.
But none were injured.