1. Socio-economic condition,
2. Interference or obstruction social or religious behavior of one over the other,
3. 3rd party involvement.
In India Hindu-Muslim relations began to strain from the first decade of 20th century after the announcement of partition of Bengal by Lord Curzon and a riot-torn history of Hindu-Muslim relations developed during 1920-1940, in-spite of the several attempts made by Gandhi and Jinnah for Hindu-Muslim unity.
The Mopla rebillion was British-Muslim and Hindu-Muslim conflict in Kerala that occurred in 1921. During the early months of 1921, multiple events including the Khilafat movement and the Karachi resolution fueled the fires of rebillion among the Mopla Muslim community . Thousands of Hindu were murdered, raped, and forcibly converted as a pert of the riots. It was the religious revivalism of the Muslim Moplas and hostility towards the Landlord Hindu Nair.Nambudiri Jenmi community and the British administrationthat supported the latter.Malabar Coast
In the year 1921-22, communal jealously did not subside.The Muharram Celebrations had bee attended by serious riots both in Bengal and in the Punjab. In the latter province in particular, communal feeling at Multan reached very serious heights, and although the casualty list was comparatively small, a great deal of property was done.
Though the year 19222-23 was a peaceful year the relations between the two communities were strained throughout 1923-24. But in no locality did this tension produce such tragic consequences as in the city of Kohat.
The immediate cause of the trouble was the publication and circulation of a pamplet containing virulently anti-Islamic poem which caused a casuality of 155 lives and wounded many with a damage of property of rs 9 lakhs.as a result the whole Hindu population evacuated the city Kohat.
In 1924-25, in the month of July severe fighting broke out between Hindus and Muslims in Delhiaccompanied by Lahore, Lucknou, Muradabad, Bhagalpur, Nagpur, Sahajahanpur, Kankinarah.
1925-26 the antagonisms between the Hindus and Muslims became widespread in calcutta, the United Provinces , the Central Provinces andthe Bombay presidency.
The year 1926-27 was one of continuous period of communal riots. Since April 1926, every month witnessed affrays more or less serious between the two communities.In Calcutta during April 1926 , 40 riots took placeduring 12 months.
Kohat City