Workers polishing the outside of a Peruvian jetliner forgot to remove duct tape they had put over crucial sensors, leading to a crash last month that killed all 70 people aboard, NBC News reported.

The Aeroperu Boeing 757 crashed into the Pacific Ocean on Oct. 2 shortly after takeoff from Lima, Peru.Workers had placed the duct tape over the sensors - which monitor air pressure and help track altitude and airspeed - while polishing the outside of the plane, NBC reported Monday.

In Seattle, Liz Verdier, a spokeswoman for Boeing Commercial Airplane Group, said that only the National Transportation Safety Board could comment on the investigation. A call to NTSB offices in Washington after hours Monday was answered by a recording.

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