The attack on CPM and BJP-RSS workers and their houses over the Sabarimala women entry row continued on Saturday morning.
Bombs hurled at the houses of Thalassery MLA and CPIM leader A N Shamseer and BJP Rajya Sabha MP V Muraleedharan among other places.
DGP Loknath Behra said that 33 people are taken into preventive detention in connection with violence in Kannur district, last night. 76 cases registered in connection with attacks in Pathanamthitta district; 25 remanded and 204 people taken into preventive detention, reported news agency ANI.
Unidentified persons riding a bike hurled a bomb at Shamseer's house at Madapeedikayil near Thalassery in Kannur district of northern Kerala at around 10.15 pm, police told PTI.
"This was an RSS conspiracy to instigate violence in the state. They intend to create violence and destroy the peaceful atmosphere of the state," Shamseer told media.
The attack happened when the Left leader was attending a peace meeting organised at Thalassery after widespread violence had hit the state following the hartal declared by right-wing groups over the entry of women in Sabarimala.
However, no one is hurt.
The incident at the ancestral house of BJP Rajya Sabha member V Muraleedharan occurred in the early hours of Saturday. No one was injured, police said.
Muraleedharan said his ancestral home at Vadiyil Peedikia near Thalassery came under attack, but no one was injured.
"My sister, brother-in-law and their daughter were in the house when the attack took place," he told PTI from Andhra Pradesh.
In another incident, unidentified people set fire to an office of the Rashtriya Swayamsevak Sangh (RSS) in Pariyaram area in the morning, police sources told PTI.
Bombs were also hurled at CPIM leader and former Kannur district secretary of CPM P Sasi's house at Thalassery and a CPM activist Vishak attacked at Iritty, a place in Kannur district.
A CPM worker's house at Perambra in Kozhikode district was also bombed.
In another development, prohibitory orders have been issued at Pandalam, Adoor and Kodumon police station areas in Pathanamthitta district for seven days.
Two shops and the house of a CPM local leader at Adoor were also attacked with bombs on Friday. Seven persons were injured in these attacks.
Pathanamthitta has witnessed widespread violence over the entry of women into the hill-top shrine of Sabarimala resulting in the death of a Sabarimala Karma Samiti member Chandran Unnithan at Pandalam.
Kerala has been marred with violence since the afternoon of January 2 after two women of menstruating age managed to enter Sabarimala temple.
The southern state has been witnessing massive protests from the right-wing organisations since the Left-led state government decided to implement the September 28 order of the Supreme Court allowing women of all ages to enter the centuries-old temple.