Video footage, taken by James Marshall, showed a yellow chopper landing in Victoria Park around 3.30pm.
A spokesperson for South East Coast Ambulance Service said: “The air ambulance landed to assist us at a call to a private address.”
The Air Ambulance Charity Kent Surrey Sussex (KSS) also provided a statement – but could not confirm the nature of the incident.
“A helicopter from Air Ambulance Charity Kent Surrey Sussex (KSS) was dispatched to Worthing on January 16,” a spokesperson said.
"We are unable to provide further comment on this incident.”
1. Air ambulance lands
Video footage showed a yellow chopper landing in Victoria Park, Worthing around 3.30pm Photo: James Marshall (still image from video)