China on Friday warned the United States it did not tolerate interference over Washington's comments this week on rewards offered by the Hong Kong government leading to the arrest of six national security suspects.

"China is strongly dissatisfied and firmly opposes this. Hong Kong affairs are purely China's internal affairs, and we do not tolerate interference and meddling by any external power," Foreign Ministry spokeswoman Mao Ning told reporters at a regular press briefing.

"The extraterritorial application of Hong Kong's national security laws is fully consistent with international law and practice."

On Tuesday, Hong Kong authorities announced six more people living overseas were placed on the national security wanted list, offering rewards of HK$1 million each for information leading to their arrest. The US State Department called it "a form of transnational repression", adding some of those individuals were based in the US. (Agencies)