Image copyright Washington Post Express Image caption The Washington Post Express "erroneously published" the front cover on the left, featuring the male symbol, instead of the front cover on the right with a female symbol.

The Washington Post Express has apologised for an "embarrassing" mix-up on its front cover.

Leading with an article about a 150,000 strong women's rights march, the Express accidentally used a male symbol instead of a female symbol.

Social media users were quick to spot the mistake.

The paper - a free daily newspaper published by the Washington Post - was quick to apologise on its Twitter account.

One commentator referred to the blunder as a "record for largest typo".

Image copyright @kimmybetsill/Twitter

Image copyright @rococopacetic/Twitter

Image copyright @ginajasnappy/Twitter

"We made a mistake on our cover this morning and we're very embarrassed," the statement from the Washington Post Express read.

"We erroneously used a male symbol instead of a female symbol."

It also released an image of how the cover should have appeared.

Image copyright @WaPoExpress/Twitter

Written by Chris Bell, UGC & Social News team