Police have admitted they were caught off guard by an attack on Camp Sovereignty last month as they prepare for more potential clashes between rival protest groups in Melbourne this weekend. Several people were injured when a group of black-clad men attacked people at the First Nations camp after an anti-immigration rally in the CBD. Seven men, including Neo-Nazi leader Thomas Sewell, have been charged with offences linked to the incident in Kings Domain on August 31. Police are anticipating more violent clashes in Melbourne's CBD on Saturday and believe four separate groups are planning demonstrations. Victoria Police said the...