NYPD investigates videos of men leaving the city's sewer system

Men filmed by surveillance cameras are believed to be searching for valuables underground.
Reproduction via BBC
New York police are investigating several videos that have emerged in recent weeks showing groups of people entering and leaving the city's sewer system.
Men filmed by surveillance cameras in neighborhoods of Brooklyn and Queens are believed to be searching for valuables underground, US media reported citing police sources.
It is not yet clear whether the same group is behind all the incidents. In one video, several men are seen removing a manhole cover and then descending into the sewer, before reappearing hours later.
"Entering the sewer system is both illegal and extremely dangerous," a spokesperson for the city's Department of Environmental Protection (DEP) told the BBC.
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"Sewers can contain numerous hazards, including harmful and potentially deadly gases, unstable surfaces, flood risks and confined spaces," said a spokesperson for DEP. "For these reasons, members of the public should never enter a pipe, drain, manhole or sewage outfall."
Last week, police received reports of several unidentified individuals removing manhole covers and entering the sewer system.
"The individuals then left the scene in an unmarked vehicle for unknown destinations," the New York Police Department told the BBC. "There were no injuries. There are no arrests, and the investigation remains ongoing."
The men who were seen on video climbing out of a manhole are believed to be "treasure hunters" and urban explorers looking for valuables in the sewer system, law enforcement sources told CBS News.
The men could face robbery charges if captured.

Source: G1