Violent protesters go berserk during the 19th straight week of demonstration in Hong Kong, on Oct 13, 2019, trashing shops and metro stations and erecting road blocks around the city. (PHOTO / CHINA DAILY)

HONG KONG – Unauthorized demonstrations and gatherings raged multiple locations across Hong Kong on Sunday, escalating into violent acts after groups of black-clad vandals blocked major roads, and vandalized shops, public facilities and MTR stations.

The day's demonstration was marked by flash protests across the Asian business hub with violent protesters attacked targeted businesses with mainland ties at different shopping centers.