A Hong Kong cop shot a protester in the chest with a live round Tuesday after demonstrators attacked his unit during clashes that coincided with a celebration by the territory’s Chinese rulers of the 70th anniversary of the People’s Republic.

“An officer discharged his firearm after coming under attack and a protester was struck in the chest in Tsuen Wan district today,” a police source told Agence France-Presse on condition of anonymity.

The stricken protester received first aid from police before paramedics arrived, the source said, adding that the victim was rushed to Princess Margaret Hospital.

A Hospital Authority spokeswoman told AFP that 15 people had been admitted to hospitals following Tuesday’s clashes, one of whom was in critical condition at Princess Margaret.

She would not confirm if that patient was the person who had been shot.

Meanwhile, President Trump tweeted: “Congratulations to President Xi and the Chinese people on the 70th Anniversary of the People’s Republic of China!”

Two videos shared online showed several riot police officers clashing with a dozen masked protesters, some of whom were using umbrellas and metal poles to strike the cops.

One officer with his sidearm drawn was seen kicking a protester before firing at nearly point-blank range into the chest of a protester brandishing a metal pole.

A gunshot was heard as the protester stumbled backward and fell over a police officer who had been knocked to the ground as the rest of the demonstrators fled.

A second video — captured by Hong Kong University’s Campus TV — showed the same incident from a different vantage point, according to AFP.

Footage filmed by local broadcaster Stand News also showed officers treating the bloodied but conscious man, who had an oxygen mask on his face.

Meanwhile, riot police fired water cannons and volleys of tear gas to disperse demonstrators who lobbed Molotov cocktails outside the central offices in the Admiralty area, while the violence also mounted across the harbor in Kowloon and beyond in the New Territories, Reuters reported.

Authorities said “rioters” had used corrosive fluid in Tuen Mun in the west of the New Territories, “injuring multiple police officers and reporters.” No details were immediately available.

Nearly four months of clashes have plunged the former British colony into its biggest political crisis in decades, posing the most serious popular challenge to President Xi Jinping since he came to power.

Citing public safety, the government of embattled leader Carrie Lam — who left for Beijing on Monday to celebrate China’s birthday on the mainland — has canceled an annual Oct. 1 fireworks display over the city’s Victoria Harbour.

In a stark contrast to the unrest in Hong Kong, Beijing’s carefully choreographed anniversary festivities included troops marching through part of Tiananmen Square with new missiles and floats

celebrating the country’s technological prowess.

Lam was shown on TV smiling as a float celebrating Hong Kong rolled by while she sat with Chinese officials, according to Reuters.

The Communist Party leadership is intent on projecting an image of national strength and unity in the face of challenges including Hong Kong’s unrest.

“On our journey forward, we must uphold the principles of peaceful reunification and one country, two systems; maintain lasting prosperity and stability in Hong Kong and Macau … and continue to strive for the motherland’s complete reunification,” Xi said in a nationally televised speech in Beijing.

Xi delivered the remarks at the site where late Communist Party patriarch Mao Zedong proclaimed the nation’s founding on Oct. 1, 1949.

His rallying cry came before a pageant showcasing China’s industrial and scientific achievements, including advanced weaponry such as DF-17 ballistic missiles believed capable of circumventing US defense systems, according to Bloomberg News.

The tightly choreographed celebration sought to reinforce the strength of a party facing several threats — from Trump’s trade war and slowing economic growth to violent unrest in one of Asia’s top financial hubs.

“Today, a socialist China is standing in the east of the world and there is no force that can shake the foundation of this great nation,” Xi told a crowd of carefully vetted guests, Bloomberg News reported. “No force can stop the Chinese people and the Chinese nation from forging ahead.”