South Korea’s military fired warning shots after North Korean soldiers briefly crossed the Military Demarcation Line separating the two countries for the second time in two weeks, according to South Korea’s Joint Chiefs of Staff.

Around 20 to 30 North Korean soldiers working in the Demilitarized Zone crossed the border at around 8:30 a.m. Tuesday, the joint chiefs said. They returned to their side of the border after South Korea conducted warning broadcasts and fired warning shots.

There was no unusual activity from the North Korean soldiers after the warning shots, according to the joint chiefs.

A similar incident occurred earlier this month when another group of North Korean soldiers crossed the border and retreated after South Korea’s warning shots.

Both incidents are believed to be unintentional.

“Our military is closely monitoring North Korean military activities in the front-line area while guarding against accidental situations,” the joint chiefs said in a statement.

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Tensions between the two Koreas remain high. In response to North Korea’s launch of more than 1,000 trash-filled balloons into South Korea, the latter has blasted K-pop music and radio broadcasts through loudspeakers at the border. Earlier this month, a group of South Korean activists floated balloons carrying propaganda leaflets into North Korea.

Both Koreas have scrapped their 2018 military agreement, allowing them to resume military training in the areas around the border.