A 47-year-old Pattali Makkal Katchi (PMK) functionary was hacked to death by a gang in Chengalpattu on Sunday night.
A special police team nabbed one of the suspects early on Monday, after opening fire at him, when he attempted to attack it, sources said.
On the morning of Monday, relatives of the victim, Nagaraj, and party cadre, staged a protest, blocking Grand Southern Trunk Road. They refused to accept the body of Nagaraj demanding justice. As tension prevailed in the town, the police tightened security on G.S.T. Road and at Chengalpattu Government Hospital.