According to a TOI report, the 'knocking' incidents are taking place since last four days in Mogaveera Patna area of Ullal and the residents have even attempted to nab the culprit, but he reportedly gave them the slip.
On Tuesday night, 'alert' residents even spotted a man, who was trying to knock the doors, but he was chased by them.
Police has appealed to locals to maintain calm.
The 'mystery' man could not be caught and left his bike there. Then, the angered residents damaged his bike.
In retaliation, people from another community pelted stones on houses, damaged a car and set two boats on fire, leading to a communal strife.
As the incident sparked off tension, the police on Wednesday beefed up the security and imposed prohibitory orders in the area up to 6 pm till February 8, in view of the simmering tension.
Women demanded action and protested in front of Ullal police station.
Meanwhile, the police has also appealed to locals to maintain calm.