Hong Kong police shot a pro-democracy protester yesterday as the city was lashed by its worst unrest of the year, hours after China celebrated 70 years of Communist Party rule with a massive military parade.

It was the first such shooting in nearly four months of increasingly violent protests and threatened to strip the spotlight from China's carefully choreographed birthday party, designed to underscore its status as a global superpower.

While President Xi Jinping took salutes from some 15,000 troops in the capital, pro-democracy protesters in Hong Kong threw eggs at his portrait, with tens of thousands of people defying police orders to disperse.

Running battles raged for hours across multiple locations, with some hardcore protesters hurling rocks and petrol bombs, while police responded for the most part with tear gas, rubber bullets and water cannon.

Chinese participants take part in a gala in Tiananmen Square in Beijing yesterday, to mark the 70th anniversary of the founding of the People’s Republic of China; Photo: AFP, Reuters

In Tsuen Wan district, a police officer unloaded his weapon at close range into a young man after his unit was attacked by protesters armed with poles and umbrellas, videos filmed by student reporters showed.

Police said the officer feared for his life when he fired the weapon, hitting an 18-year-old man. The wounded protester received first aid from officers before paramedics arrived and took him to hospital, police added.

Medical authorities said 31 people were admitted to hospital, two in a critical condition.

Burning barricades sent a pall of black smoke over the city, a regional hub for some of the world's biggest banks.

Police detain demonstrators in Hong Kong; DF-41 intercontinental ballistic missiles drive past Tiananmen Square during the parade; Photo: AFP, Reuters

Former colonial ruler Britain, who handed Hong Kong back to China in 1997, decried the use of live ammunition as "disproportionate". Foreign Secretary Dominic Raab said that "it only risks inflaming the situation".

The violence cast a shadow over the lavish parade in Beijing where tanks, new nuclear missiles and a supersonic drone were paraded as Xi and other top officials -- including Hong Kong chief executive Carrie Lam -- watched from a rostrum overlooking Tiananmen Square.

The event was meant to showcase China's journey from a poor nation broken by war to the world's second largest economy.

Supporters of Uighurs hold an anti-China protest in front of the Chinese consulate in Istanbul; Photo: AFP, Reuters

Xi, who wore the distinctive "Mao suit", delivered a speech invoking the "Chinese dream" of national rejuvenation -- his grand vision of restoring the country to perceived past glory.

"There is no force that can shake the foundation of this great nation," Xi said from the Tiananmen rostrum where Chairman Mao Zedong proclaimed the People's Republic of China on October 1, 1949.

Indian police detain Tibetan activists in New Delhi. Photo: AFP, Reuters

Helicopters flew in a "70" formation as troops goosestepped across Tiananmen Square in what state media described as the country's biggest military parade, featuring 580 pieces of armament and 160 aircraft.

The People's Liberation Army brought out its newest hardware, including a nuclear-capable intercontinental ballistic missile with range enough to reach the entire United States and a launcher for a hypersonic glider.

Photo: AFP, Reuters