Per FNC, the razor wire is strung along the top of the chain link fence.
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The pictures show nothing but a standard roll of chain-link. The “reporters” likely mistook the sawtooth end of the chainlink as what they think is “razor wire” which shows they have zero idea of what is actually razor wire or the difference between that and barbed wire. But I suppose as is typical with “reporting”, razor wire sounds scarier, so razor wire it is.
https://www.foxnews.com/us/saks-fifth-avenue-flagship-store-razor-wire-looting
“The second phase of the job saw workers further fortify the fencing with a coil of razor wire along the top edge.”
FWIW. :-)
The video at the site shows razor wire being placed on the top.
https://nypost.com/2020/06/02/saks-fifth-avenue-is-wrapped-in-razor-wire-to-prevent-looting/