Disney characters and dancers celebrate the 30th anniversary of the Tokyo Disneyland during a ceremony at the Disney theme park in Urayasu, suburban Tokyo on April 15, 2013. 
Photo by Yoshikazu Tsuno/AFP/Getty

Disney Japan apologizes for tweet on Nagasaki bombing anniversary

Updated

Walt Disney Japan has apologized for a tweet expressing congratulations on the 70th anniversary of the atomic bombing of Nagasaki.

A post on Disney Japan’s corporate account on Sunday featured a picture of Alice from the animated movie “Alice in Wonderland” and a line from one of the movie’s songs in English: “A very merry unbirthday to you.”

The text in the tweet, in Japanese, translated roughly to “congratulations on a not special day.”

Twitter users quickly expressed outrage, many in Japanese and some in English and other languages.

The Disney Japan tweet was deleted but was shared widely online.

Disney Japan on Monday posted a tweet offering “deep apologies” for having caused discomfort. The tweet said social media managers would be more careful in the future.

The Walt Disney Co. operates more than 1,000 social media accounts, according to its website.

RELATED: Hiroshima 70th anniversary: Nuclear bomb ‘should never be used again’

A longer statement on Disney Japan’s website blamed the poorly timed tweet on “insufficient note of the day of dispatch.”

More than 74,000 people were killed in the American bombing of Nagasaki, three days after the bombing of Hiroshima. Japanese citizens mark the anniversaries with solemn ceremonies.

This article first appeared on NBCNews.com.

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Disney Japan apologizes for tweet on Nagasaki bombing anniversary

Updated