NEW YORK (CBSNewYork) — More than 30 manhole covers have been stolen across the city since early March, posing a serious danger to pedestrians and motorists, Con Ed officials said.

The utility believes the manhole covers — which have been stolen in Brooklyn, Queens and the Bronx — are being sold for scrap metal.

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The covers can weigh anywhere between 150 and 300 pounds, spokesman Mike Clendenin said.

“There’s not really any practical use for them at all or even decoration,” Clendenin said.

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Witnesses have reported seeing people dressed in utility apparel — without any official company markings — pry open the manhole covers using car jacks and then load them onto pick-up trucks before driving off.

Con Ed is working closely with the NYPD to quickly combat the problem, especially since open manholes are dangerous.

“You’ve got a hole in the ground and someone can fall and seriously hurt themselves; you’ve also got live electricity,” Clendenin said.

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Any New Yorkers who spot any suspicious individuals working near manholes or removing the covers are asked to call 911 immediately.