North Korea fired a ballistic missile on Tuesday, according to a South Korean news agency.

Yonhap News Agency, which reported the missile launch, cited the South Korean military.

The missile was reportedly fired from South Pyongan Province early Wednesday local time. South Korea and the United States are analyzing the details of the launch, South Korea’s Joint Chiefs of Staff told Yonhap.

Earlier on Tuesday Reuters reported that U.S. government experts believed the regime was likely to launch a missile “within days.”

This story is developing. Please check back for updates.