The demonstrators, hailing from Biafra in eastern Nigeria, paid homage to those killed during the 1967-1970 period while defending Biafra and lit candles in their memories.
They also demanded release of their leader Nmamdi Kanu jailed since October 2015.
Nigeria after gaining independence in 1960 plunged into a civil war with its eastern state Biafra seceding from it and existing as an independent state from May 30, 1967 to January 1970.
After a two-and-half-year-long war in which a large number of Biafrans died, the secessionist state was finally reunited with Nigeria.
"We want freedom for our people. We want support from the Indian government for the people of Biafra," said another demonstrator, Prince George.
Similar demonstrations and memorial services were organised by the consultative council committee of Biafrans in different cities of the world.