Beyonce's singer sister Solange Knowles has scrapped two U.S. shows due to "scheduling conflicts and weather concerns".

Knowles was booked to perform in Chicago, Illinois, on Saturday night (23Feb13), and in Washington, D.C. on Wednesday (27Feb13), but she has axed both dates citing logistical difficulties and worries over bad weather on America's East Coast.

In a post on Twitter.com, she writes, "I'm very very sad to announce my shows in Chicago & Dc (Feb 27) are postponed due to scheduling conflicts & weather concerns...

"New venue/dates will be announced Asap and ticket holders will be honoured!"