North Korea conducted live-fire drills near its western maritime border with the South late Wednesday.
 
South Korea's Joint Chiefs of Staff said the North fired about 130 rounds between nine and 10:25 Wednesday night near waters north of the Northern Limit Line (NLL).
 
The drills came about six hours after the North notified the South of its plans.
 
The South Korean military convened an emergency counterattack force immediately after the firing began and upgraded its military response position.
 
South Korea's military authorities said the drill was a clear attempt to raise tensions, warning that the South's military is in a combat-ready posture in preparation for additional provocations.
 
North Korea also held a live-fire drill in waters north of the NLL at the end of March last year, when some of the rounds fell south of the NLL.