The Central Bank of Egypt issued a statement attributing the closures on Monday to "the strikes of worker in some authorities, including public banks" and noting banks were already due to be closed Tuesday as an official holiday.
State television asked bank employees, upset about alleged corruption among bankers, to consider the national interest in the wake of the revolt that drove longtime President Hosni Mubarak from office Friday.
The news of the bank closures came several hours after the Egyptian military dissolved Egypt's Parliament, suspended the Constitution and called for elections in six months -- sweeping steps that echoed protesters' demands.
The military also announced the formation of a committee to draw up constitutional reforms to be put to a popular vote.
Many protesters hailed the developments, but Nobel Peace laureate Mohamed ElBaradei, a former U.N. nuclear inspector and new opposition spokesman, said he was concerned the military was in sole control.
"I understand that the army might need some time, but they need to lay out what they are up to. We need heavy participation by the civilians," he told CNN. "It cannot be the army running the show."