Protesters and police clashed in Hong Kong for a second straight day on Sunday, throwing the city's business and shopping belt into chaos and sparking fears of more ugly scenes leading up to China's National Day this week.

Protesters are planning to march again on Tuesday despite a police ban, raising fears of more violent confrontations that could embarrass Chinese President Xi Jinping as his ruling Communist Party marks 70 years since taking power on Tuesday. 

Posters are calling for October 1 to be marked as "A Day of Grief."