The Metropolitan Police said Kamar Williams, 33, is from the Isle of Dogs and if spotted, members of the public 'should not approach him' but call 999 immediately.
In a statement, the Met said a post-mortem examination held on Thursday gave Mr Thomas' cause of death as a stab wound to the chest.
Tom Joyner, managing director for Go-Ahead London, said Mr Thomas 'was fatally injured in an isolated incident while on his way home from work'.
'The entire team at Go-Ahead London is saddened by this incident and the tragic loss of one of their colleagues,' said Tom Joyner.
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