WASHINGTON — The prospect for a federal government shutdown grew more ominous Thursday, leaving state and local groups with unanswered questions about whether federal payments will be halted if lawmakers fail to reach agreement on a fiscal 2011 budget compromise before midnight Friday.

The governmental groups were concerned about everything from Internal Revenue Service Build America Bond payments and sales of state and local government series securities to issuers, to temporary assistance for needy families and housing assistance, sources said.

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