NYPD Commissioner Ray Kelly warned Tuesday that police and security can't let their guard down considering the recent spike in global terrorism. The NY Daily News reports that Kelly, while speaking at the 30th annual NYPD Shield conference, said “more than ever this is a time for vigilance, not complacency.”

Kelly explained that an attack on a "soft target" such as a mall could happen if police let their guards down. Kelly used the Sept. 21 terrorist attacks at the Westgate Mall in Nairobi, Kenya as an example of what could happen. This is why the NYPD held a simulation drill at the Kings Plaza Mall in Brooklyn last month.

"Law enforcement knows that you have to move to the shooter and you have to move quickly and that's what we practiced," Kelly explained (via NY1) when discussing the simulation drill. "There were some hurdles and obstacles put in their way, but a lot of it has to do with getting there, assessing the situation, making a tactical plan and responding as quickly as reasonably possible.”

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