Hong Kong democracy activist Joshua Wong was arrested Friday ahead of plans for another weekend of protests in the Chinese-ruled city, which is grappling with its biggest political crisis since its handover to Beijing more than two decades ago.

Wong, the face of Hong Kong's push for full democracy during protests in 2014 that paralyzed parts of the city for 79 days, was released from jail in June after serving a five-week term for contempt of court.

"He was suddenly pushed into a private car on the street," wrote Wong's group Demosisto, which advocates for greater democracy in Hong Kong, on its official Twitter account on Friday.