The US Federal Communications Commission is meeting in Atlanta today to investigate why communication networks collapsed in the wake of hurricane Katrina.
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Senior fixed line, wireless and TV broadcasting executives have been summoned to give reports on the failings, as reports of patchy user access to communications in the New Orleans region continue.
The FCC wants to find ways to prevent such failings happening again, particularly as similar problems occurred after the 11 September attacks.
In New Orleans, police were unable to communicate over fixed and wireless networks, which was a major factor in the authorities losing control of the city.