Emma White told Sky News: "I hope today's the day - for Paul, for the mum and dad, for the sister and for those girls."

"It's just that lightbulb moment - anything you think that's small, just come forward... In this day and age how can someone just disappear. It makes no sense?"

People are carrying pictures of Ms Bulley and placards in the hope it will jog someone's memory.

Friends admitted that hopes were "diminishing" but that they had to keep on hoping for a breakthrough.

"I go back to those two little girls missing their mummy," said Ms White. "That's why we're here - any information to give them hope."

The search is continuing for the mother-of-two, whose phone was found still connected to a work call, with her dog running loose.

She was last seen on 27 January at about 9.15am on a path by the River Wyre in the Lancashire village of St Michael's on Wyre.

A potential witness in a red coat has now been identified, police have said.

Ms Bulley's sister and father told Sky News they have been "stuck in a nightmare" since her disappearance and that "her children need her home".

Louise Cunningham told Sky News: "We're going round and round in circles trying to piece together what could have possibly happened.

"It's like she's just vanished into thin air. We just want her home, we need her home, her children need her home. It's absolutely heartbreaking."

Her father Ernie Bulley, 73, spoke of the "pain" the "close-knit family" are feeling.

"This has just emptied our lives at the minute, we just feel so empty," he said.

"We appreciate everything everyone is doing to find her. The police have been brilliant, the local community has been outstanding. But at the end of the day we just want her back."