What more details you want dear ? A 'song' was being played in the marriage procession of 'one' community. So, 'second' community objected to it. Because 'the' song had 'some' derogatory references to 'something' the 'second' community revered. Then, 'one' community threw bricks and bottles on 'another' community. Soon it was full scale rioting. 'One' community attacked n burnt property of 'another' community, 'another' community also retaliated. Police opened fire in which members of 'one' community were killed. This is known as SECULAR reporting my dear.