The State Department had said Samira Ibrahim would be among recipients of an International Women of Courage award presented by Secretary of State John Kerry and first lady Michelle Obama on Friday.
Now the State Department says she won't be honoured on Friday because of anti-American and anti-Semitic comments on her Twitter account.
State Department spokeswoman Victoria Nuland said on Thursday officials will first study the tweets, which include support for attacks against US diplomatic installations and praise for a terrorist assault against Israeli citizens in Bulgaria.
Ibrahim is already in the US. She says her account was hacked, though the comments stretch back several months.
Washington: The Obama administration is postponing an award for an Egyptian activist who was subjected to a "virginity test" after protesting in Cairo's Tahrir Square.
First Published: Friday, March 08, 2013, 08:33