Foreign journalists in North Korea were told to prepare for a “big and important” event Thursday.

No details were provided about the event, including whether it was related to the current political climate, Reuters reports.

Tensions have increased in the area over fears of another missile test. The country fired a ballistic missile into the Sea of Japan earlier this month.

On Saturday, the U.S. sent a Navy carrier strike group towards the Korean peninsula to demonstrate force.

Approximately 200 journalists are stationed in North Korea for the “Day of the Sun,” the 105th anniversary of the country’s founding President Kim Il-sung.

READ MORE: China Urges Trump to Pursue a ‘Peaceful’ Resolution to North Korea Tensions

Calls for journalists to prepare for similar events have happened in the past, and have not resulted in anything major, according to Reuters.

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Write to Alana Abramson at Alana.Abramson@time.com.