A crude bomb was hurled at the office of Bharatiya Janata Party on Wednesday, said police.
Accordin to the reports, there was no casualty in the incident.
The incident occurred at around midnight. Glass panes of the main entrance door were damaged in the incident, Thiruvananthapuram city police commissioner, S Sparjan Kumar said.
Around three to four BJP workers were present on the top floor of the office when the crude bomb was hurled.
BJP sources said the crude bomb exploded hardly 45 minutes after state President Kummanam Rajasekharan left the office.
To protest over the incident, BJP is taking out a march to the Secretariat here at 10 am, the sources said. The incident occurred at the new office of the party.
-With PTI inputs