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Twenty minutes from the Chinese mainland, a Hong Kong community is grieving.

A young life has been lost; a 21-year-old woman fell to her death last Saturday.

Lo Hiu Yan's friends say she left a message demanding the controversial extradition bill be withdrawn.

Her suicide is one of four in the last three weeks where a note or reference has been found to the ongoing political crisis.

"I feel a bit powerless. I don't know why she tried to do this, to end her life," her friend, Dennis, 26, sobbed. "I just feel regret and I really hope that no more Hong Kong people try to end their lives like this."

At a vigil where Lo died, neighbours join strangers in prayer.

People carry white flowers which they pile around flickering tea-lights.

Mourning is a traditionally private affair in Hong Kong, but these deaths have prompted public outpourings of grief.

Some have started calling them "martyrs", saying they died for the cause.

On 15 June, a 35-year-old man wearing a yellow raincoat jumped from a building near the city's parliament.

Police spent hours trying to talk Mr Leung down.

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His yellow jacket declaring "Carrie Lam is murdering Hong Kong" has become a symbol of the protest.

It's depicted in pro-democracy artwork and posters, and people carry copies of it through the streets on marches.

On social media, he is celebrated by some as a freedom fighter or hero.

It's a worrying situation for the city's psychologists who fear that with no solution in sight, copycat suicides could follow.

"I think it's probably the first time we have witnessed this in Hong Kong," explained Dr Eliza Cheung, clinical psychologist for the Hong Kong Red Cross.

"We are worried that some of the protesters' deaths are being glorified, especially on social media, and this could pose some risk factors, especially to those who have some pre-existing mental health conditions."

Experts say suicide is unlikely to have one single trigger and that one event should not be seen as the only cause of a complex issue.

Hong Kong's summer of discontent is putting a strain on residents.

A crisis hotline run by The Samaritan Befrienders group has seen a surge in calls relating to the extradition bill.

Between March and the end of May they got just eight calls. In June, that rose to 36. In the first five days of July they've already had 18.

A similar service run by the Red Cross received 99 calls between 12 June and 3rd July.

The callers are young and old, worried parents, frustrated protesters and demoralised police officers.

It seems no-one is immune from the stress, with Robert Wong, chairman of the Samaritan Befrienders, warning Hong Kong could be on the brink of a mental health crisis.

"This event, no matter if you are for or against, it will not be a one- or two-day issue. It will be a long term issue to discuss and argue, so if we continue to have this kind of tense, emotional disturbance for everybody in Hong Kong, it definitely will be a crisis," he told Sky News.

Despite the pressure, the government is refusing to back down and meet the demonstrators' demands.

Hong Kong's chief secretary for administration, Matthew Cheung Kin-chung, admitted to reporters that youth welfare is a major concern.

"Nothing is more important than life and we should do everything we can to help people, particularly those suffering from various mental depression in the present environment. If they feel they are in difficulty, they should consult professionals and talk to their relatives, talk to their friends," he said.

But so far the peaceful marches have failed to secure the protesters' demands. So too has the storming of parliament and as hopelessness and frustration grows, some in this city are becoming increasingly desperate.

:: Anyone feeling emotionally distressed or suicidal can call Samaritans for help on 116 123 or email [email protected] in the UK. In the US, call the Samaritans branch in your area or 1 (800) 273-TALK.