Japanese emergency officials say tsunami waves caused by Tuesday's strong earthquake pushed upstream on rivers in northeastern Japan.
The officials said shortly before 8:30 AM on Tuesday, the water was flowing back about 300 meters above the mouth of the Natori River in Sendai City, Miyagi Prefecture.
They also confirmed waves going up the Yoshida River in Higashimatsushima City in the prefecture, raising water levels about 30 to 40 centimeters.
In Fukushima Prefecture, shortly after 7 AM the Jizou River rose about 30 centimeters as tsunami waves barreled upstream.
Local residents also witnessed waves flowing upstream in the regions affected by the earthquake.
A video posted to Twitter by a man shows the Bindagawa River in Iwaki City slowly flowing upstream. The man said he took the video from a bridge just before 7 AM on Tuesday.
Another video uploaded by a local woman to YouTube shows tsunami hitting a river in Tagajo City, Miyagi Prefecture. In the video shot at about 8 AM, powerful waves can be seen rolling upstream.