It is not known whether he got into a disagreement with someone who did not agree with his views on the Voice.
Police issued a statement saying that emergency services were called to Strathfield Railway Station about 4pm following reports of an assault.
Police were told two men – aged 79 and 66 – engaged in a physical altercation with the 79-year-old man subsequently treated by NSW Ambulance paramedics.
Lim’s lawyer Chris Murphy confirmed that his client had been hospitalised and was undergoing a CAT scan to assess a head injury and an eye bleed.
“Beautiful kindly Danny Lim has today suffered a hostile attack while peacefully supporting the Yes vote,” Murphy said.
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This is not the first time that Lim’s peaceful protests have ended up less than peacefully.
Lim has also had other run-ins with authorities, including in 2015 when he was fined for offensive conduct for a vulgar sign criticising then prime minister Tony Abbott.
The fine was later quashed in court.
Lim moved to Australia from Malaysia in 1963 and served as a councillor on Strathfield Council from 2008 to 2012, campaigning on “openness, transparency, accountability and morality” and refusing to be paid while in office.