The protest was exactly a week after the death of Arthur Holscher-Ermert who died after an unmarked police car hit him on the A259 by Bramber Avenue in Peacehaven on Saturday, April 30 at around 11.10pm, The Argus reported.People gathered with signs, t-shirts and flowers at 1pm next to Lewes skatepark for Arthur.Jens Ermert, Arthur and Karl’s father, attended with a t-shirt stating “justice for Arthur”. While other family members also joined from Germany including their cousin Kaspar Ermert who made the trip from Cologne in western Germany.The crowd of more than 100 people ambled up Mayhew Way before arriving at Sussex Police’s HQ in Church Lane.Upon arrival, crowds stood at the front entrance where chants of “justice for Arthur” continued.The 27-year-old, from Newhaven, was driving an Audi which was being pursued by another police car.Led by his brother Karl, the crowd demanded justice for Arthur Holscher-Ermert, 27, who was killed by police in a high speed car chase on Saturday night.They accused the police of criminal conduct for Arthur’s death and trying to cover the crime up after the police car are alleged to have swerved to hit him. Officers then tried to handcuff him as he was dying.His dying moments were captured on the mobile phone cameras of at least three bystanders and have since gone viral on social media — along with the claims of other eye witnesses who allege that the car driven by Sussex Police deliberately swerved towards Arthur and ‘mowed him down’.For his family, the footage makes devastating viewing.A dash-cam recording shows the moment Arthur was struck as he ran across the road. A second clip shows him on the floor, groaning and writhing in pain while being restrained and handcuffed by uniformed officers. A third shows him on his back, next to a pool of blood, as a female officer pumps his chest, according to the Daily Mail. And while an investigation by the Independent Police Complaints Commission is already under way, and a police officer is the subject of a criminal investigation, a wave of outrage has been growing steadily all week, with #justiceforArthur trending online. A demonstration march is planned to take place today outside Sussex Police headquarters in Lewes.After leaving Sussex Police’s HQ, the protest went through Lewes town center and up to Lewes Crown Court in the High Street.Yesterday, a Sussex Police constable was formally notified by the IOPC that he is under criminal investigation for the offence of causing death by dangerous driving.