STRAVA users are being urged to check their app data to help in the search for missing Jack O'Sullivan who vanished without a trace after a night out.

Jack, 23, was last seen at 3.15am on Saturday, March 2 in the area of Brunel Lock Road/Brunel Way, in Bristol.

Jack, who is described as white, around 5ft 10ins tall, of slim build, with short, brown hair, was on a night out with his friends when he went missing. 

Hundreds of taxi drivers have been interviewed and thousands of hours of CCTV reviewed but Jack's disappearance remains a mystery.

Now an appeal has been posted on the 'FIND JACK' Facebook page - with more than 60k members - for Strava users to check their accounts.

A web user who made the post is urging users of the physical activity tracking app  to activate Strava Flyby which shows a map of your activity route.

Strava Flyby also reveals when other Strava users crossed the same path or were nearby and they believe it could reveal witnesses or other important information.

Those searching for Jack are hopeful the chain of 'flybys' could reveal more people who were in the Brunel Lock and Brunel Way area the night or morning he disappeared.

The social media user wrote: "By following this chain of flybys, searchers could potentially find a wider network of people who were in the general area that night/morning. 

"Each of these individuals might have a small piece of information that, when put together, could help build a clearer picture of what happened. 

"As well as exact times, routes, etc. people often post photos onto their Strava activities. 

"It could cast a wider net and might help uncover details that wouldn't otherwise be found."

Jack was wearing a quilted green/brown Barbour jacket, a beige woolen jumper, navy chinos and brown leather trainers with white soles when he vanished in March.

His family previously made a formal complaint about a police force's attempts to find him and said they had ''lost all faith'' in Avon and Somerset Police's investigation.

They say that errors were made in early searches and crucial CCTV footage was initially missed.

A GoFundMe fundraising page was set up by family friend with the aim of raising money to generate new leads earlier this month.

They want to offer £20k to "regnite the search efforts" and said if unclaimed the money would go to charity Missing People.

HOW TO ACTIVATE A FLYBY ON STRAVA (WEBSITE ONLY)

- Log in to Strava website (not app)
- Profile pic > Settings > Privacy Controls > Flybys
- Set to "Everyone"
- Find your March 2nd 2024 activity (or possibly into the night of the 1st March):
- Privacy Controls > "Everyone"
- Save and click "View flybys"
- Tick the boxes next to any other Strava users shown on your flyby page to show how they interacted with your route
- Check for routes near Bristol/Hotwells or connecting to those areas