A Melbourne teenager discussed painting a kangaroo with the Islamic State group's symbol, packing it with explosives and letting it loose on police as part of an alleged terror plot on Anzac Day, court documents have alleged. Sevdet Besim, 19, from Hallam, in Melbourne's outer south-east, pleaded not guilty to four charges relating to planning a terrorist act over the phone and internet in the lead-up to Anzac Day in Melbourne last year. Prosecutors withdrew another charge of conspiring to commit the attack. They also accused Besim of communicating with a teenager overseas, as well as planning to behead or run over a police officer on Anzac Day because the date would make the attack more memorable. A summary of telegram communications allegedly between the two teenagers, presented by the prosecution, detailed a conversation about using a kangaroo as part of an attack.