New Delhi, March 6 -- A 26-year-old man was killed and at least three people were injured after a clash broke out between two families from different communities in Uttam Nagar's JJ Colony in southwest Delhi late Wednesday night, allegedly triggered by a water-filled balloon thrown during Holi celebrations, police officers said on Thursday. By Thursday evening, police said four people were arrested and a minor boy apprehended in connection with the incident. All of them belong to the Muslim family involved in the clash. Heavy police deployment was made in the neighbourhood after the violence triggered communal tensions. A senior police officer said several people gathered outside the Muslim family's house on Thursday and attempted to attack...