Police in Western Australia are investigating a “device” thrown into the crowd at the city’s Invasion Day rally, sparking a security scare that ended the protest. Speaking to the media on Monday afternoon, the WA police commissioner, Col Blanch, said a 31-year-old man had been arrested after allegedly throwing the device. The device allegedly contained “ball bearings, contained screws, and those items were wrapped around an unknown liquid in a glass container”, Blanch said. WA police issued a warning on Monday afternoon, urging the public to stay away from the area and await further advice, saying they had deployed “significant...