The White House budget office on Monday evening directed federal agencies to begin preparing for a government shutdown, minutes ahead of a deadline for a new spending bill.

“Unfortunately, we do not have a clear indication that Congress will act in time for the President to sign a Continuing Resolution before the end of the day tomorrow, October 1, 2013,” wrote OMB Director Sylvia Burwell in a memo. “Therefore, agencies should now execute plans for an orderly shutdown due to the absence of appropriations.”

The memo came as the House and the Senate remained deadlocked on a spending bill to continue funding the federal government. House conservatives have tied their funding measures to efforts to defund or delay Obamacare. Those bills though were rejected by the Democratically-controlled Senate.

Burwell called on federal agencies to “continue to closely monitor developments” and urged lawmakers to resume efforts to pass a continuing resolution.

“We urge Congress to act quickly to pass a Continuing Resolution to provide a short-term bridge that ensures sufficient time to pass a budget for the remainder of the fiscal year, and to restore the operation of critical public services and programs that will be impacted by a lapse in appropriations,” she wrote.