Some media personnel had reportedly tried to make video footage of the group attacking and damaging a private bus, which had knocked down a motorcycle rider in the afternoon, Kottakkal Sub-Inspector Manjith Lal said.
The group reportedly objected to this, following which the media personnel abstained from filming the incident and gathered near the 'Mathrubhumi' office.
The protesters became suspicious and some of them hurled stones at the glass door, barged into the office of the daily and went on a rampage, damaging furniture, glass cabinets and telephones.
The bus knocked down the motorcycle rider in front of the Kottakkal HMS Hospital. However, no ne was injured in the accident, Lal said.
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Meanwhile, some locals staged an agitation on the Kozhikode-Thrissur road, damaged the bus and prevented media from filming their act, the SI said.
No media personnel was injured, he said.
A case under sections of rioting was registered and investigations are on, police said, adding, no one has been arrested.