China dismissed on Friday media reports that an X-band radar unit, part of a controversial US anti-missile system, has arrived in the Republic of Korea and urged that its deployment be immediately halted.

The media reports indicated that the X-band radar, a key component of the Terminal High Altitude Area Defense system, or THAAD, arrived at the Osan Air Base about 60 kilometers south of the capital city of Seoul on Thursday.

"The ROK Foreign Ministry has made a clarification to China, saying the reports are not true," Foreign Ministry spokeswoman Hua Chunying said on Friday at a daily news conference in Beijing.