Despite early reports that no Americans were harmed, 11 U.S. service members did sustain injuries.
It's the first retaliatory action by Iran in the wake of Maj. Gen. Qasem Soleimani's killing.
The Pentagon flight-tested a missile that had been banned under a treaty that the U.S. and Russia abandoned last summer.
Foreign experts speculate that North Korea tested a new high-thrust engine, which is needed to launch more powerful rockets.
A Navy warship has seized a "significant cache" of suspected Iranian guided missile parts headed to rebels in Yemen.
The country is continuing its drive to establish regional dominance.
Seoul's Joint Chiefs of Staff said the weapons were fired from a region near the North Korean capital of Pyongyang.
The Defense Department last month asked the North Dakota Public Service Commission to consider new rules.
Ultimately, four brigades of tanks will get the new system.
Some observers say North Korea's threat may be a tactic to pressure the U.S. into making concessions.