US media have quoted sources as saying North Korea launched short-range missiles last weekend.
The Washington Post reported on Tuesday that "North Korea fired off multiple short-range missiles last weekend, according to people familiar with the situation."
ABC News said that a US official confirmed Tuesday that "North Korea fired two short-range missiles sometime Saturday and Sunday."
Neither media outlet specified from where the missiles were launched or where they landed.
US Defense Department spokesperson John Kirby declined to comment on the reports at a news conference on Tuesday.
Pyongyang has not made any announcements on the reported launches.
The US and South Korea staged joint military drills from March 8 through 18 for emergency scenarios on the Korean Peninsula. The exercises were the first of their kind since the inauguration of US President Joe Biden's administration in January.
North Korean leader Kim Jong Un's younger sister, Kim Yo Jong, issued a statement criticizing the drills.
If the launches were confirmed, they were the first by North Korea since the Biden administration was formed.
Analysts say the launches were aimed at keeping the Biden administration in check as Washington has been stepping up its diplomatic activities.
US Secretary of State Antony Blinken and Defense Secretary Lloyd Austin visited Japan and South Korea last week.