Hong Kong activist Joshua Wong urged supporters to "hang on" after he was sentenced to more than a year in jail for leading a protest outside police headquarters last year, prompting angry cries outside the court in one of the most high-profile cases in the government's crackdown on the pro-democracy movement.

Prominent Hong Kong activist Joshua Wong was taken into custody on Monday after he pleaded guilty to inciting and organizing an unauthorized assembly for his part in a dramatic siege of police headquarters last year during the city's mass protests.