Miscreants on Monday attacked a Christian prayer hall and disturbed proceedings in Mangalore, police said.
About 15 people threw stones and ransacked the prayer hall in the morning in Kodikal.
Police said they do not suspect the involvement of any outfit. A case has been registered against a localite, they said.
In an unrelated incident, three persons were injured when two groups of Christians clashed at a church in Belthangady in Dakshina Kannada district.