Our correspondent says that the demonstrators have called for reinforcements to come and protect them and there is a danger of more clashes.

BBC: Protesters injured in Egypt clash

For the rally, Mr. O'Grady has called in some non-AFGE labor reinforcements colleagues at the AFL-CIO and at several government agencies to provide advice and warm bodies at the barricades.

WSJ: Demonstration Against Sequestration Has Reasons, but Few Rhymes