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(CBS/CNET)– YouTube appeared to be experiencing widespread service disruption Tuesday night, showing users a blank website frame instead of the usual site populated by videos.

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Users trying access videos or upload content were greeted instead with an internal server error message. The outage appears to have begun around 9 p.m. ET, according to outage monitors and comments on Twitter.

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YouTube says they are working to resolve the issue.

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The Philadelphia Police Department is reminding residents not to call 9-1-1 to report the outage.