A woman has lodged a police report against an e-scooter rider who allegedly hit her 69-year-old father and caused him to be hospitalised.

She is appealing to the public to help nab the culprit.

According to Facebook user Hui Ying, her father was crossing the road on Thursday night at about 9.30pm when a man on an e-scooter assaulted him.

She said the rider had been speeding and the plastic bag her father held "accidentally brushed the man on his helmet" when he raised his arm in reflex.

The rider stopped and attacked her father, and two passers-by are said to have come to his aid.

The rider fled when Ms Hui Ying's father said he was going to call the police.

Ms Hui Ying said her father was in hospital from his injuries - cuts and bruises - and had suffered a heart attack after the assault.

The police told The Sunday Times yesterday that they were alerted to a case of voluntarily causing hurt along Hougang Avenue 7 at 9.26pm on Thursday.

Investigations are ongoing, and The Sunday Times understands that the culprit is still at large.

The Singapore Civil Defence Force said it received a call for ambulance assistance at Block 316 Hougang Avenue 7 at about 10pm that day. It took a patient, who had bruises on his lips, to Tan Tock Seng Hospital.