Repeated gunshots startled beachgoers, prompting them to flee as police officers arrived on scene, showed an eyewitness video of the Bondi mass shooting recorded on Sunday (Dec 14).br br Two alleged gunmen who killed 15 people at a Jewish celebration at Sydney's Bondi Beach were a father and son, police said on Monday (Dec 15), as Australia began mourning victims of its worst gun violence in almost 30 years.