Alva Review-Courier -

TORONTO (AP) — Canada's worst mass shooting erupted from an argument between the gunman and his girlfriend, who survived the attack, police confirmed Friday.

Royal Canadian Mounted Police Supt. Darren Campbell said the weekend shooting rampage started with an assault by the suspect on his girlfriend and ended with 22 people dead in communities across central and northern Nova Scotia.

"She did manage to escape. That could well have been the catalyst of events," Campbell said.

Authorities are also not discounting the suspect planned some of the murders.

Campbell said the girlfriend hid overnight...