A 2.9 magnitude earthquake struck North Korea's northwestern province bordering China on Thursday, the South Korean weather agency said.The quake struck an area 26 kilometers southeast of Ryongrim, Jagang Province, at 11 a.m., with its epicenter at a latitude of 40.32 degrees north and a longitude of 126.86 degrees east at a depth of 27 kilometers, the Korea Meteorological Administration said.The earthquake is believed to have occurred naturally, it added.Source: Yonhap News Agency