Shots fired near G20 security zone...

It seems like the protestors are going to get ugly....

Police are investigating after shots were fired in the Entertainment District near the G20 security zone early Tuesday.

The shots were heard near John St. and King St. W. around 3:15 a.m.

Police found three shell casings from a small caliber gun in the area.

The incident happened close to the yellow G20 security zone, where more than 5,000 police officers are set to patrol downtown Toronto during the G20 summit.