We can confirm that a highly experienced instructor, along with a student skydiver undertaking a first orientation jump, were involved in a fatal accident yesterday. The exact causes are under investigation and as yet are unknown.

Our sympathies go out to the families and friends of both men as well as those in our skydiving community. We are doing our best to ensure any support is provided to our staff, skydivers and those involved at the scene itself.

Our staff and expert accident investigators from The Australian Parachute Federation are assisting police with the investigation into what is an extremely unusual event. We thank the police and paramedics who have been so supportive of all those involved.

The sport of Skydiving is an outdoor adventure activity and it is as safe as it can possibly be with the advancements in technology, training and safety. We understand there are risks, and unfortunately, sometimes accidents do happen.

This is the first fatality involving a first orientation Tandem skydive the company has had in over 40 years of operation and is an extremely rare incident.

The particular skydive the two men were undertaking was not especially challenging for a highly experienced instructor, who had done nearly 10,000 skydives and had nearly 30 years experience in the sport. The jump was from normal height and it is not yet clear what occurred.

The centre will be closed today, Sunday, out of respect and to ensure we look after all those involved. We thank everyone for their understanding and patience as investigations continue into the cause of this very sad and tragic event.

Earlier: It was meant to be an experience of a lifetime, but for one young man, his life tragically ended after he was killed, along with his instructor during a skydiving accident in Wilton.

The man, aged in his 20s was on a tandem skydive with an experienced instructor aged in his 60s, when they crash landed onto the driveway of a rural property on Wilton Road, one kilometre from the designated landing site at Sydney Skydivers.

It's understood the pair were part of a group of skydivers that took off from the local skydive centre on Picton Road. The rest of the group landed safely.

A local resident raised the alarm about the accident just after 2pm on Saturday.

Colombian tourist, Catalina Granados, who is holidaying in Sydney, was in the last group to jump for the day and said she was shocked to hear about the incident.

"They didn't tell us when it happened, they made us wait around three hours and they told us what happened when we were back in Sydney," Ms Granados said.

"After we changed our clothes, all the instructors were called to go somewhere else ... but we didn't know anything."

Ms Granados had jumped just 20 minutes before the accident occurred.

She was flooded with messages from family and friends on social media concerned for her welfare.

"We are fine!! Thank God all of us went well!! 20 minutes after our landing happened this unfortunate accident... we are fine!!", she posted.

Another skydiver in an earlier group told Fairfax Media that concerns about the wind directions were raised before their jump, but her jump was straightforward.

Weather conditions at the time of the accident were partly cloudy with winds W/SW 15 to 25 km/h.

A crime scene has been established and investigations into the incident are underway. It's understood the men died on impact.

A report will be prepared for the Coroner.