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A 3-year-old boy died after he fell into a septic tank in his neighbor’s backyard Sunday afternoon in Lakewood, according to the .

Investigators said the young boy was playing with his 4-year-old brother and a 6-year-old neighbor just before the incident in the 10300 block of 93rd Street Court Southwest.

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Sgt. Darren Moss, a sheriff’s department spokesperson, told ³ÉÈËXÕ¾ Newsradio at some point, the boy lifted the lid on the septic tank and fell in. The lid is about the same size as a manhole cover.

A family member called 911 shortly after 2 p.m.

“The 3-year-old removed the lid to the neighbor’s septic tank and fell in,” Moss added. “The 4-year-old went inside and told the grandmother who called 911.”

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Moss said an adult was in and out of the house with the children at the time. Emergency responders with West Pierce Fire and Rescue arrived and pulled the child through the small opening to the tank shortly after 3 p.m. Deputies said the child was pronounced dead at the scene.

Pierce County detectives and forensic investigators were called to the scene to document the incident. Investigators believe the boy drowned, however, there is no word on the official cause of death.

Luke Duecy is a reporter for ³ÉÈËXÕ¾ Newsradio.