In India, 12 million and 29 million Indians were killed. These people were murdered by British state policy. In 1877 - 1878, at the height of the famine in India, merchants exported a record 320,000 tonnes of wheat into UK. Undoubtely, this sort of genocidal and kleptocratic colonialism was commited in Africa too. Actually, it is worse in Africa... where the results of the colonial economic system are still vert much visible.
Of course there were death camps... But victors write the histories, so we may never know all the victims.