Some worry about retaliation by ethnic Tutsi - especially those who took over their houses when they fled months ago.
But the government and army, as well as much of the economic life, are dominated by ethnic Tutsi.
One of the biggest dangers facing the rebel leader is a backlash against ethnic Tutsi, the core of his fighting force.
As an ethnic Tutsi, Niyongabo was already born with a certain degree of privilege.
There is no hard evidence to support this charge, but most of the rebels who attacked Mugunga camp were ethnic Tutsi, witnesses said.
And soldiers forbade a dozen women trying to leave the country from entering the airport, saying they were ethnic Tutsi.
The majority of the soldiers patrolling the streets are ethnic Tutsi from eastern Zaire.
The war began as a limited uprising by ethnic Tutsi whom the Government threatened with expulsion.
It was impossible to determine whether the rebels killed today in public were ethnic Tutsi.
The core of the Zairian rebels are ethnic Tutsi.