Soulful, beautiful prayers from a centuries-old religion ring out in sadness, but there's an undercurrent of anger in the wake of a horrifying fire attack police struggled to explain.

More than 100 cab drivers, many from the Sikh community, chant and dip heads in unison, a tribute to much-loved bus driver Manmeet Sharma, also known as Manmeet Alisher.

At 29 the actor, singer, community man was due to be married.

Instead, he died in a bus blaze so fierce it blew out the driver-side window and burned to death a man who was "larger than life".