In the latest incident, cyclist Brittany Slater required dental surgery after losing control on the oil on Sunday night. Cyclist Brittany Slater required dental surgery after losing control on the oil on Sunday night. Credit:Channel Nine Ms Slater, 21, was riding home on the Capital City Trail about 11pm when she hit the slick. "As I rode through the oil, the bike slipped underneath me ... I fell on my nose and my teeth," she told Channel Nine. The same track, used by about 1000 cyclists each day, was targeted three weeks ago.

"When it first happened, I was like, 'That's horrible. Why would someone do that?'," Ms Slater said. The damage to Ms Slater's teeth. Credit:Channel Nine "To do it a second time, that's just crazy." Cyclists have called for temporary cameras to be installed on the trail to catch the offender. "I don't think this person cares at this point in time but I don't think he also knows who he's actually targeting," Edward Hore from the Australian Cycle Alliance told Nine.

Constable Lauren McCormack said the oil was believed to be diesel oil, which was dark in colour and difficult to see on the paths. Most incidents had occurred at night or dusk. "Once they get to it, they're hitting it and just sliding off their bikes," she said. "They're just losing control." Oil slicks have also been reported on the Dynon Road path, particularly on the bend between Dynon and Arden roads. Bicycle Network chief executive Craig Richards said a few riders had reported oil on bike paths and the group had spoken to Victoria Police.

But he urged cyclists not to "overreact publicly" and give offenders the satisfaction they seek. "These incidents seem like a hard-to-fathom cry for attention," he said. The cyclist injured on Sunday night is urged to contact Constable McCormack at Melbourne North police station on 8379 0800. Anyone with information can call Crime Stoppers on 1800 333 000.