HONG KONG — The Hong Kong police on Thursday blocked plans for a weekend march in a satellite town where a mob of thuggish men armed with sticks and poles had earlier injured dozens of people in an attack apparently designed to intimidate participants in a weekslong protest movement.

The organizer of the weekend march, which is meant to denounce the anemic police response to that earlier attack, said he would appeal. Some protesters have signaled that they will go ahead with the event whether it is approved or not, a sign that police opposition and increasingly strident denunciations from Chinese officials and local leaders are doing little to curb the demonstrations.

The march was planned for Saturday in the town of Yuen Long, where thugs believed to be connected with organized crime groups attacked people in and around a train station. The attackers, who were dressed in white shirts, were apparently targeting people who were coming home from earlier demonstrations. They lashed out indiscriminately, injuring journalists, a lawmaker and protesters as well as people with no connection to the protests.

The police said that holding a march in Yuen Long, close to villages where some of the attackers fled Sunday night, raised the likelihood of further violence. The police added that they had received 13 letters from Yuen Long district leaders and 1,700 letters from members of the public worried about the safety of the planned march and some urging the police to reject its permit application.