An Ayyappa pilgrim was injured in an explosion that took place at nearby Thrikkakara, when some devotees were having dinner near the Ayyappa Seva Sangh office, police said.
The pilgrim from Tamil Nadu suffered minor injuries in the explosion that occurred last night, they said.
Police said they have begun a probe into the incident.
Meanwhile workers of BJP and some Hindu outfits observed a 12-hour hartal in Trikkakara and blocked vehicular traffic for some time this morning.
Ernakulam District Collector Sheikh Pareeth and top police officials visited the spot early this morning.
