Boy, 13, falls 25 feet into Los Angeles sewage pipes sparking a 100-person ...

Firefighters are still searching for 13-year-old Jesse Hernandez (pictured)

Firefighters are still searching for 13-year-old Jesse Hernandez (pictured)

Firefighters are desperately searching for a 13-year-old boy who fell into a network of underground sewage pipes leading into the Los Angeles River.

Jesse Hernandez, was playing in a maintenance shed near Griffith Park when he fell into the drainage system through a 4-foot-wide pipe - sparking a 100-person manhunt, reports KTLA.

More than 20 members of the Hernandez family had been picnicking in Griffith Park, an annual Easter tradition, when the boy went missing.

Crews were called to 5254 West Zoo Drive around 4.30pm on Sunday night.

The teen plunged 25 feet through the roof of the concrete structure into a drainage ditch, Los Angeles Fire Department (LAFD) Captain Erik Scott said.

'One was jumping on top of a wooden plank,

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