North Korea fired two unidentified projectiles from the eastern coastal city of Wonsan on Monday, South Korea's defence ministry said.
"The military is monitoring for additional launches and maintaining readiness," said South Korea's Joint Chiefs of Staff.
They were unable to confirm how far the projectiles flew or whether it was ballistic or rocket artillery.
The launches come just days after North Korea's Kim Jong-Un oversaw military drills.


13 killed in explosion at Qatar's Ras Laffan LNG site
UK's Starmer resigns, paving way for orderly transfer of power
Fire at coaching centre in India's Lucknow kills at least 15
Temperatures to exceed 40C in European heatwave as three die in France
US, Iran conclude high-level talks in Switzerland, mediators say
