Thieves stole 20 phones during a single Brooklyn concert, as one expert warns it’s part of a growing trend targeting crowded music venues tied to an international black market, according to the New York Post.

Cops were called to punk band Hot Mulligan’s performance at the Brooklyn Paramount on Nov. 7 when a slew of unsuspecting concertgoers were seemingly pickpocketed– with the thieves turning off the phones so they couldn’t be tracked, officials confirmed to the paper.

Attendee James Crowley, 31, said he saw multiple people scanning the floor at the Downtown Brooklyn venue, looking for phones that they thought they might have dropped.

The incident is the latest in a growing series of mass phone thefts, with the stolen goods oftentimes winding up in China as part of a wildly-lucrative

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