At least 21 people were injured after a 6.7-magnitude earthquake rocked Japan's Yamagata Prefecture, according to NHK.  

A tsunami alert has been issued for the coastal regions, including Yamagata, Niigata Ishikawa prefectures.

The quake occurred at around 10:22 p.m. local time at a depth of 14 kilometers.

About 1,000 people evacuated their homes, NHK reported on Wednesday. 

(Top image: Japan Meteorological Agency official Koji Nakamura speaks in Tokyo on June 19, 2019. /VCG Photo)