A strong earthquake has struck the greater Tokyo region. The quake hit after 4:00 a.m. on Thursday while most people were still asleep.

Officials with Japan's Meteorological Agency estimate its magnitude at 5.2 and the focus at a depth of 40 kilometers.

But they say there is no threat of tsunami.

Police say they have not received any reports of injuries so far.

Officials advise people in the region to pay attention to the situation.