By Rebecca Shabad - 03/31/14 07:27 AM EDT
North Korea fired more than 100 artillery rounds into South Korean waters on Monday, causing South Korea to fire back, according to multiple reports.
The provocative actions by North Korea were part of an exercise Pyongyang said it would conduct in response to the United Nations’ warning against its missile launches last week.
In response, South Korea fired more than 300 artillery rounds into North Korean waters, and moved its F-15s to its side of the maritime border.
The heightened tensions forced South Korea to evacuate residents who live on islands in the Yellow Sea near the exchanges, the Associated Press reported.
No shells were fired on land or military installations.