Air passengers from so-called Group A, or designated high-risk countries, are set to be banned from transiting through Hong Kong International Airport, according to people familiar with the matter, another move in the financial hub’s aggressive effort to shield itself from omicron.

Airport officials recently briefed carriers about the plan, the people said, asking not to be identified because the details aren’t yet public. The suspension will start on Jan. 15 and run through Feb. 14, though the end date will be subject to review, one of the people said. Procedures for how the ban will operate are still to be laid out, another person said.