Police in Brampton, Ont., say Wednesday's double-homicide in a normally quiet plaza was "completely unprovoked." - "This was a stranger attack, completely unprovoked, in broad daylight, in Brampton," Insp. Norm English told a midafternoon news conference. - Nazifa Shahghasy, 52, and her husband Rahimullah Shahghasy, 53, were stabbed and killed in the plaza on Red Maple Drive for no known reason, according to police. - "Yesterday they attended the plaza together for a medical appointment," English said. "Afterwards, the husband was buying food, while his wife was making an appointment in the dentist's office. - "Also in the plaza at that time was a male who for unknown reasons attacked Nazifa Shahghasy as she was returning to her vehicle. This man was armed with two knives, and the attack was completely unprovoked," English said. - "The husband saw what was occurring and attempted to save his wife, but was overpowered by the male....