new marchesIn Baton Rouge - Louisiana - where Alton Sterling was shot dead last week... in St Paul - Minnesotawhere Philando Caltile was killed in his car...and in other cities across America... where the same message was heard.:police must change its attitude towards Black men - killed or brutalised by officers more often than any other part of society... upsot: justice...VOX Eddie Willis, protester (partially overlaid by Black people don't get fair treatment. We used to be former slaves, we were segregated less than 50 years ago. We just got the right to vote. We got a black president, but that's not enough. We need a lot more change"hundreds were arrested....most for blocking roads... including prominent Black Lives Matter activists.... and journalists.In some areas - like Baton Rouge - protesters clashed with police... wounding officers...activists and authorities both blamed the violence on protesters arriving from other states..President Barack Obama tried to defuse the tension from Spain - where he shortened his visit to return home:Barack Obama, US President: " the overwhelming majority of people who are involved in the Black Lives Matter movement really want to see is a better relationship between the police and the community so that they can feel that is serving them. And the best way to do that is to bring allies…President obama said that those who attack officers - are only doing a desservice to the cause...