Fireworks explode over Victoria Harbour at the end of a weekend of celebrations to mark the 10th anniversary of Hong Kong's return to China from Britain.
At midnight on Saturday, Buddhist monks marked the exact anniversary of the return by tolling a bell to pray for a better future.
On Sunday morning, Chief Executive Donald Tsang was sworn in for a second term in office by Chinese President Hu Jintao.
Mr Hu then joined Mr Tsang to officially open the new Shenzhen Bay Bridge linking Hong Kong with the mainland.
Chinese helicopters carrying flags were part of the pomp and ceremony of the official celebrations.
Dragon dancers and marching bands paraded through the streets and bystanders waved Chinese flags.
But not everyone was celebrating. Pro-democracy activists took to the streets for their annual protest march.
The activists are demanding sweeping reforms in the Hong Kong government, including universal suffrage.
Two giant pandas, Ying Ying and Lok Lok, were mainland China's anniversary gift. They are currently the star attractions at Ocean Park.