The US has transported coolant to a Japanese nuclear power plant affected by the massive earthquake, as it quickly moved naval and air assets along with humanitarian relief material for the tsunami-hit areas of the country.
"We just had our Air Force assets in Japan transport some really important coolant to one of the nuclear plants," Secretary of State Hillary Clinton announced on Friday, as Tokyo declared a state of emergency for five of its nuclear reactors at two atomic power plants in northeastern coast of Japan, where an 8.9-magnitude quake struck yesterday.
Japan is very reliant on nuclear power and they have very high engineering standards, but one of their plants came under a lot of stress with the earthquake and did not have enough coolant, she said.
"So Air Force planes were able to deliver that. So we're really deeply involved in trying to do as much as we can on behalf of the Japanese and on behalf of US citizens," Clinton said.
The safety of Japan's nuclear plants also came up when US President Barack Obama telephoned Japanese Prime Minister Naoto Kan.
"When I spoke to Prime Minister Kan, I specifically asked him about the nuclear plants and their potential vulnerability as a consequence of the earthquake. He indicated that they are monitoring the situation very closely," Obama said.
"So far, they have not seen evidence of radiation leaks. But, obviously, you've got to take all potential precautions," he said.
Obama said he has asked Energy Secretary Steve Chu to be in close contact with their personnel to provide any assistance that is necessary, but also to make sure that if, in fact, there have been breaches in the safety system of these nuclear plants and that they are dealt with right away.
Obama said he has dispatched a second ship to the region for possible relief and rescue operation. "We currently have an aircraft carrier in Japan, and another is on its way. We also have a ship en route to the Marianas Islands to assist as needed," he said.
"The Defence Department is working to account for all our military personnel in Japan," he said.
The US embassy personnel in Tokyo have moved to an offsite location.
The State Department is working to account for and assist all American citizens who are in the country.