Nova Scotia grieves after shooting rampage

There are still so many unanswered questions about what happened in Nova Scotia this past weekend. What we do know is that a lone gunman went on a 12-hour shooting rampage across the province. He set fire to five structures, impersonated a police officer and left at least 18 victims dead. Today, CBC News reporter Brett Ruskin joins us from Portapique, N.S., to report on one of the deadliest mass shootings in Canadian history.