A candlelight vigil has been held for a Hong Kong student who died during protests over the weekend.

Chow Tsz-lok, 22, an undergraduate at the Hong Kong University of Science and Technology (UST), died of injuries he suffered early on Monday when he fell from the third to the second floor of a car park during a police dispersal operation.

It is the first first student death in months of anti-government demonstrations in the Chinese-ruled city that is likely to be a trigger for fresh unrest.

Mr Chow's death is expected to spark fresh protests and fuel further anger at police, who are already under pressure amid accusations of excessive force as the city grapples with its worst political crisis in decades.

UST students trashed a campus branch of Starbucks, part of a franchise perceived to be pro-Beijing, and rallies are expected across the territory as dusk falls, a traditional time for violence to pick up.

"Condemn police brutality," they wrote on the restaurant's glass wall.

Demonstrators had thronged the hospital this week to pray for Mr Chow, leaving flowers and hundreds of get-well messages on walls and notice boards inside the building. 

Students also staged rallies at universities across the former British colony.

"Wake up soon. Remember we need to meet under the Leg Co," said one message, referring to the territory's Legislative Council, one of the targets of the protest rallies.

"There are still lots of things for you to experience in your life."

Fellow UST student Ben, 25, said Mr Chow was "a nice young person" who liked playing netball and basketball.

He said: "I hope he can rest in peace. I really miss him".

The university has called for an independent investigation. UST President, Wei Shyy, has demanded clarification from all parties.

The government expressed "great sorrow and regret" at Mr Chow's death. A police spokesperson said they will "spend every effort to investigate the cause", and urged the public to remain "calm and rational".

Students and young people have been at the forefront of the hundreds of thousands who have taken to the streets since June to press for greater democracy, among other demands, and rally against perceived Chinese meddling in the Asian financial hub.

The protests, ignited by a now-scrapped extradition bill allowing people to be sent to mainland China for trial, have evolved into wider calls for democracy, posing one of the biggest challenges for Chinese President Xi Jinping since he took charge in 2012.

Two pro-Beijing newspapers ran full-page ads, commissioned by "a group of Hong Kong people," calling for the lowest-tier 24 November district council elections to be postponed, a move which would infuriate those calling for democracy.

Protesters have thrown petrol bombs and vandalised banks, stores and metro stations, while police have fired rubber bullets, tear gas, water cannons and, in some cases, live ammunition in scenes of chaos.

In June, Marco Leung, 35, fell to his death from construction scaffolding after unfurling banners against the extradition bill. 

Several young people who have taken their own lives in recent months have been linked to the protests.