Apparent terrorist attacks on London commuter systems spark heightened concerns about U.S. mass transit vulnerabilities.
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Bills in each chamber differ on whether to extend whistleblower rights to employees.
Workers say the approach holds out the hope for higher pay increases.
Measure could whither even though lawmakers, the private sector and government officials that Homeland Security must do more to prevent cyber attacks.
Defense and Homeland Security are creating a list of mandatory firing offenses, and unions are worried.
A $6.9 million contract will safeguard 4 million computers in both offices and homes with security software.
Lawmakers say the Pentagon low-balled the cost of closing the New London Submarine Base.