"We will continue to do our utmost to collect,analyse,and monitor information,"the ministry said in a statement on Twitter.
If confirmed as a ballistic missile,it would be the fourth round of launches this month as North Korean troops conduct ongoing military drills,usually personally overseen by leader Kim Jong-un.
"Coming this early in the year,the only time we've seen tests this frequently were in 2016 and 2017,both of which were huge years for North Korea's missile program,"Shea Cotton,senior researcher at the James Martin Centre for Nonproliferation Studies,said in a post on Twitter.
The last test launch was on March 21. Based on photographs released by North Korean state media,analysts identified those weapons as KN-24 short-range ballistic missiles.
United Nations Security Council resolutions bar North Korea from testing ballistic missiles,and the country has been heavily sanctioned over its missile and nuclear weapons programs.
This month's military drills have been conducted despite a border lockdown and quarantine measures imposed in North Korea in an effort to prevent an outbreak of the new coronavirus,or of the disease the virus causes known as COVID-19.