Police say they have identified two young men who allegedly launched an unprovoked attack on a senior Victorian police officer near a train station in Melbourne's inner-east.
The bashing occurred about 5:30pm on Saturday in the grounds of St Kevin's College, near the Heyington railway station in Toorak.
Transit and Public Safety Command Assistant Commissioner Chris O'Neill was the victim of the attack, in which he was kicked and punched in the head and chest.
The 60-year-old remained in hospital on Monday morning with two fractured ribs, and was undergoing tests for head injuries and possible kidney damage.
Assistant Commissioner Bob Hill told ABC Radio Melbourne his colleague was likely to be in hospital for some time.
He said the attack, which was not captured on CCTV, occurred after two men in their late teens were removed from a Glen Waverley train by authorised transit officers.
"Their antisocial behaviour included vomiting and urinating in the carriage, so they were as I understand, evicted from the train at Heyington and that's where, unfortunately, Chris crossed paths with two of them," Assistant Commissioner Hill said.