The official, 64, had half a day's pay docked as punishment and the bosses called a news conference to apologise.
The princess, the widow of a cousin of Emperor Akihito, has no plans to meet with Russian dignitaries, Kyodo said.
Prime Minister Shinzo Abe said authorities were assessing damage and that their top priority was the safety of residents. At least 234 people were injured, public broadcaster NHK said.
Japan's Prime Minister Shinzo Abe on Tuesday welcomed a document signed by North Korea's leader at an unprecedented summit with US President Donald Trump as a "first step" towards denuclearisation.
Qatar Electricity and Water Company (QEWC) signed an agreement with Japanese company Marubeni to facilitate visits by Qatari engineers, employees and joint venture companies to Marubeni plants and projects in various locations in Japan, the Philippines and Oman.
With less than a week to go before meeting North Korean leader Kim Jong Un, US President Donald Trump plays host Thursday to Japanese Prime Minister Shinzo Abe, who wants his voice heard ahead of the unprecedented talks.
A woman was killed and three other people injured Monday as a car driven by a 90-year-old driver ploughed into pedestrians in eastern Japan, officials said.
The country's trade surplus registered 49.3% and 10.7% increase on yearly and monthly basis respectively.