(Bloomberg) -- A Hong Kong court added 10 months to pro-democracy activist Joshua Wong’s jail term, raising concern the city is broadening its crackdown on dissent.

The ruling by Hong Kong’s District Court came Thursday after the 24-year-old recently pleaded guilty to taking part in an unauthorized assembly in 2020 — a crime punishable by up to five years in jail. Wong and thousands of others held a vigil on June 4 to commemorate the 1989 Tiananmen Square crackdown, defying an unprecedented ban on the event that authorities said was necessary due to the pandemic.

The sentence represents the latest setback for the pro-democracy movement, which has been under siege since Beijing imposed a national security law on the former British colony last year, giving authorities broad powers to tackle dissent. Aside from Wong, the subject of a 2017 Netflix documentary, authorities have charged or jailed dozens of opposition figures, including media mogul Jimmy Lai, triggering condemnation from the U.S. and other Western governments.

Wong was already serving a 13 1/2 month sentence for leading a protest outside police headquarters in 2019. Local media reported that a court added another four months to his jail term in April for violating a mask ban and joining another unauthorized rally.

He’s also charged with subversion in a case involving 47 defendants — including many former lawmakers — for helping organize a primary election that authorities said was the first step in a plan to vote down the budget and force the resignation of the city’s chief executive.

Three other activists drew jail sentences Thursday ranging from four months to six months for participating in the June 4 vigil, an annual ritual in the city that was halted for the first time in 2020. Officials have decided to ban the event again this year because of the pandemic, according to the Hong Kong Free Press.

©2021 Bloomberg L.P.