Protesters block the lobby of the Hong Kong Revenue Tower in Hong Kong on Monday, June 24, 2019. Hong Kong has been rocked by major protests for the past two weeks over legislative proposals that many view as eroding the territory's judicial independence and, more broadly, as a sign of Chinese government efforts to chip away at the city's freedoms. (AP Photo/Kin Cheung)

HONG KONG (AP) — Protesters fearing an erosion of Hong Kong’s legal autonomy blocked access to a government office building for nearly two hours today and plan more demonstrations to draw the attention of leaders attending the G-20 summit this week.

About 100 demonstrators jammed the entryway and lobby of the Inland Revenue Tower, a skyscraper in the Wan Chai district in the city center.

Earlier, one of the main protest groups announced a demonstration planned on Wednesday to try to draw the attention of world leaders attending the Group of 20 summit in Japan.

The leaders of the Civil Human Rights Front said they hope the world leaders meeting in Osaka will hear the protesters’ concerns over the weakening of the city’s legal autonomy by mainland China.

Hundreds of thousands of people have filled the streets and sidewalks in recent weeks to oppose legislation seen as increasing Beijing’s control and police treatment of the protesters. The activists spoke today near the city government headquarters, where a few protesters remained though the offices in the building had reopened.

Kelvin Ho, one of the group’s several leaders, said the protest was meant to “urge the international community to give stress on Beijing that we need democracy.”

China has rejected foreign commentary over the protests and the extradition issue as interference in its internal affairs.

At a briefing in Beijing, Zhang Jun, an assistant foreign minister, said “I can tell you that for sure the G-20 will not discuss the issue of Hong Kong and we will not allow the G-20 to discuss the issue of Hong Kong.”

Hong Kong’s government “has taken a series of measures to safeguard fairness and justice of society and to block loopholes in the legal system. We believe what they have done is completely necessary and the central government supports these measures,” he said.

Joshua Wong, another activist who helped galvanize mass pro-democracy protests in 2014, said on Twitter that he was urging his followers to join the protest on Wednesday.