Magnitude 7.4 earthquake strikes Japan, tsunami warning issued

An earthquake with a preliminary magnitude of 7.4 hit north central Japan on Monday, public broadcaster NHK said.

The Japan Meteorological Agency issued a tsunami warning along coastal regions of Ishikawa, Niigata and Toyama prefectures. Hokuriku Electric Power said it is checking for any irregularities at its nuclear power plants, NHK reported.