"We are aware of reports that the Democratic People's Republic of Korea (DPRK) fired ballistic missiles. We are monitoring and continuing to assess the situation in close coordination with our regional allies and partners," State Department spokeswoman Julia Mason said.
"We strongly condemn this and North Korea's other recent missile tests, which violate multiple UN Security Council Resolutions explicitly prohibiting North Korea's launches using ballistic missile technology," Mason said.
"We intend to raise our concerns at the UN to bolster international resolve in holding the DPRK accountable for these provocative actions," Mason said.
America's commitment to the defence of its allies, including South Korea and Japan, in the face of these threats, remains "iron-clad", she said.
Also Read
The US remains prepared to work with its allies and partners around the world to respond to further North Korean provocations as well as to defend itself and allies from any attack or provocation, Mason said.
According to the US Strategic Command, its systems detected two North Korean missile launches on August 2, 2016.
"The simultaneous launch of two presumed No Dong intermediate range ballistic missiles occurred near the western city of Hwangju," it said.
"Initial indications reveal one of the missiles exploded immediately after launch, while the second was tracked over North Korea and into the Sea of Japan," US Strategic Command said in a statement.