Five cops have been suspended after a prisoner allegedly smuggled a gun in his buttocks and shot another prisoner in the back of a police transport van in Westchester County, authorities said Thursday.

Louis Soto, 32, pulled the gun while being transported by Mount Vernon police on Oct. 16, cops said. He shot another prisoner in the leg in the back of the van; that person has not been publicly identified.

Sources told WPIX on Thursday that Soto smuggled the gun in his buttocks . The Mount Vernon Police Department said only that “a properly conducted frisk or authorized strip search should have revealed the weapon.”

After the gunshot, cops immediately drove the van back to police headquarters, thoroughly searched all five people in the back and located a .22-caliber revolver on So

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