MONTREAL - Police and crime experts are keeping a close watch on the ever-evolving situation involving the Mafia and Montreal's shaky underworld establishment.

A series of killings targeting the once influential Rizzuto clan has left leadership up for grabs.

There are numerous theories about whose behind the killings, but the primary motivation appears to be the lucrative operations at stake.

Police believe that 2011 could be a pivotal year for whoever is trying to gain power.

One veteran officer says either the Rizzuto clan will mount some sort of offensive or they will be replaced for good.

But one thing experts and law enforcement agree on is that extended violence is bad for the bottom line.