WASHINGTON, July 16 (Reuters) - A 6.8 magnitude earthquake struck off the Japanese coast on Monday, the U.S. Geological Survey reported, hours after another quake of similar strength killed at least seven people in Japan and triggered a small leak of radioactive materials from a nuclear plant.

Reuters witnesses in Tokyo reported buildings swayed in the city after the latest quake at 1417 GMT, but there were no immediate reports of damage after the deep quake.

AlertNet news is provided by