Several trade unions, including those representing Disney cast members and teachers, announced that they would strike on Monday. Informal groups of civil servants, aviation workers, construction workers, lawyers and finance workers also said they discussed plans to strike on Telegram, a social media app where many recent protests were planned.

Mrs. Lam said during a news conference Monday morning that the disruptions “have seriously undermined Hong Kong’s law and order and are pushing our city, the city we all love and many of us helped to build, to the verge of a very dangerous situation.”

“As a result of these widespread disruptions and violence, the great majority of Hong Kong people are now in a state of great anxiety,” she added. “Some of them do not know whether they could still take some forms of public transport while others are right now being blocked on their way to work.”

Her comments followed a stark government warning Sunday night, after two days of confrontational protests that included the temporary blockage of a tunnel linking Hong Kong Island with Kowloon, that any “large-scale strikes and acts of violence will affect the livelihood and economic activities of Hong Kong citizens.”

“The now crisis in front of us is not about individual aspirations or about the bill,” Mrs. Lam said. “It is about Hong Kong’s security and safety and whether we could restore in time the law and order that not only the 7.4 million Hong Kong people values a lot, but I’m sure individuals sectors who still have a stake in this society would like us to defend.”