Hong Kong Police on Tuesday arrested five people at prohibited gatherings in Yuen Long, including a 52-year-old man for suspect violation of the national security law.

Two district councilors were among the five arrested, and 79 people were summoned for participating in prohibited gatherings by 10 p.m. on Tuesday, police added.

Crowds were formed in the vicinity of the Yuen Long MTR station and shopping malls since Tuesday afternoon despite police warning against the prohibited gathering.

Participants in such events may have committed the offense of "taking part in an unauthorized assembly" in accordance with the Public Order Ordinance and be liable to a maximum penalty of five years' imprisonment, police warned.