Chinese President Hu Jintao has arrived in Hong Kong to celebrate the 15th anniversary of the city's return to China, but he faces a noisy, unhappy public and an increasingly tense political climate.

Integration with the mainland has brought Hong Kong much success as a global financial centre but it has also created problems.

Those problems seem to be at their worst at any time since the handover, according to a series of surveys and opinion polls.

One independent poll shows the Hong Kong public's mistrust of the Chinese government stands at a post-handover high, largely because of a number of political scandals.

The BBC's Hong Kong correspondent Juliana Liu reports.