Before the Little India riots broke out last Sunday, the last riot in 'squeaky clean' Singapore occurred in 1969 many decades ago. In 1969 it was largely between ethnic Chinese and Malays, in 2013 however it involved largely foreign workers from the Indian Sub-Continent.
Read Forbes Report here for an interesting coverage of what many sees as something that will occur sooner rather than later.
Some videos of the Riots in Singapore:
This is a more interesting take on the Little India Riot by blogger GRK: