The U.S. is dismissing South Korean news reports that North Korea could be preparing to conduct another nuclear test.

State Department spokesman Philip Crowley told a regular news briefing in Washington Tuesday that the U.S. is skeptical of the reports about North Korea’s possible preparations for a third nuclear test.

Crowley said, however, that the U.S. will keep watching for evidence of any provocative activity by North Korea.

South Korean Foreign Minister Yu Myung-hwan also dismissed the report, saying that there is no information or circumstantial evidence that suggests North Korea is preparing for another nuclear test.

A South Korean newspaper reported on Tuesday that the North may be preparing for another nuclear test in May or June.