The mother of Jack O’Sullivan who has been missing for nine months has revealed she is being sent cryptic messages about someone who may have crucial information about his whereabouts.

Catherine O’Sullivan, originally from Neath, started a ‘Find Jack Group’ on Facebook to try and help locate her son.

She has been told that one member of the group, which now has more than 88,000 members, may hold the key information that would help find her son.

Jack, 23, was last seen in the early hours of Saturday, March 2, following an evening out at a party in Bristol’s Hotwells area.

Since that night, there has been no trace of him; his phone’s last known activity was after 6am in the vicinity of Cumberland Basin and Hotwells, and there has been no activity on his bank account since.

She said: ‘I get continual messages telling me the person who has the answers as to what has happened to Jack and where he is, is in this group.

‘If that is true please come forward and let someone know, you can share this information anonymously if you prefer.

‘We are a desperate family and we just need answers. Please help us! The bottom line is ‘someone knows’ what has happened to Jack. We ask please just come forward with information that could help us.’

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Jack O’Sullivan graduated from the University of Exeter and returned to Bristol for a law conversion

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Jack O’Sullivan (centre) is pictured graduating with his parents Catherine (front) and Alan (right) and brother Ben (left)

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Catherine O’Sullivan (left) says she has recieved cryptic messages about the whereabouts of her son Jack (right)

Police have reportedly suggested that Jack may have accidental fallen into the water, either at Cumberland Basin or in the River Avon, on the night he disappeared, Somerset Live reported.

‘We are desperate and we are in the hands of the public for support. Stop for a minute and think – this is a family in the worst pain imaginable. Please do anything that you can to help. Any information you have is greatly appreciated. Thank you,’ the force added.

The University of Exeter graduate, who had moved back to Bristol for the law course, went to a party on Hotwell Road, but at one point tumbled down the stairs and hit his head.

When a random partygoer joked about him having too much to drink, Jack shoved him in a brief clash, but this did not go further.

Jack texted his mum at 1.52am to say he was safe and planned to get a taxi and left the party an hour later, without saying goodbye to his female friend who was having a cigarette outside. He never returned home and has been missing ever since months.

Previously Avon and Somerset Police have refused to release his phone records to the family and Catherine said they have had to take legal action to gain access to the data that includes where it was last tracked.

Jack’s phone account belongs to Catherine although she has been unable to access the information.

Avon and Somerset Police said it rejected the family’s original approach in August – citing the Home Office Communications Data Code of Practice and General Data Protection Regulation.

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Jack’s last known movements have been retraced by his mum in a video posted to Facebook

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

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Jack’s phone sent its final GPS signal from an address in the nearby Granby Hill area at 6.44am

Officers also said the information had not taken the investigation any further to be able to locate Jack.

But Catherine, 52, of Flax Bourton, Somerset, said she wanted to review the data as she had concerns the police might have missed something.

Her post on Facebook added: ‘Any information (however small) may help us in our quest to find him.

‘I appreciate for some this is now becoming a little boring – I get told, just except it, Jack has gone and you need to move on.

‘Really – what mother on this earth would ever consider giving up on her child’.

Individuals with any information can report anonymously at [email protected].