North Korea is constructing a military site on a small island close to Yeonpyeong-do, the South Korean news site TV Chosun reported Thursday.

According to South Korean military authorities, the DPRK’s Korean People’s Army is constructing facilities on the small Yellow Sea island of Gal-do. North Korea may be constructing positions for coastal artillery and/or long-range artillery.

Gal-do is located about 2.4 kilometers from the Northern Limit Line (NLL), the de facto maritime border between North and South Korea in the Yellow Sea.

The island is about 4.5 kilometers from the South Korean island of Yeonpyeong-do, which was bombarded by