Voicing serious concen over the murder, Union Home Minister Rajnath Singh telephoned Chief Minister Oommen Chandy and sought details of the circumstances of the killing and the steps taken to track down the culprits.
Incidents of hurling of country-made bombs were reported from Kannur and pelting of stones from many parts of the state during the hartal, which hit normal life across the state. But no one was seriously injured in any of these incidents, police said.
State Home Minister Ramesh Chennithala said a special team headed by a Superintendent of Police had been constituted to probe the killing.
He said cases have been registered against eight persons who are absconding. For the time being, the prime concern was to ensure that the area remained calm, he said.
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"So far, no serious incidents of violence have been reported from the areas. We will not allow Kannur to turn again into a political killing field," Chennithala told reporters.
Country-made bombs were hurled at the car in which Manoj and his companions were travelling and the attackers then hacked him to death.
RSS-BJP leaders alleged that the CPI(M) was behind the killing and their state functionaries gathered in Kannur to pay homage to their slain colleague.
The killing happened on a day when BJP president Amit Shah was in Thiruvanathpuram.