A 4-year-old boy from western New York died at Rollins Pond Campground Tuesday.

William L. Mytych, 4, of Spencerport, near Rochester, was last seen playing with other adult family members in the water next to their campsite at the northeast end of the state campground. Emergency services responded to the campground at about 2 p.m. when the boy was reported missing.

Campers assisted in the search alongside state troopers, State Police K-9 and aviation units, state Department of Environmental Conservation police and forest rangers, the Saranac Lake Volunteer Fire Department dive team, the Tupper Lake rescue squad and campground staff.

The adjacent Rollins Pond and Fish Creek campgrounds were on lockdown. Camp employees were turning cars away at the main entrance at Fish Creek, saying no one was allowed in or out.

Mytych was found dead in the water near where he went missing at 3:39 p.m., according to State Police. Franklin County Coroner Shawn Stuart responded to the scene, pronounced the boy dead and authorized his body’s removal to a hospital for an autopsy.

While the official cause of death is not yet known, pending the autopsy, both Stuart and State Police described the incident as a drowning.

Rollins Pond and Fish Creek campgrounds are located in the town of Santa Clara, between the villages of Saranac Lake and Tupper Lake, and have roughly 600 campsites between them.

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(Correction: An earlier version of this article incorrectly said Mytych died Monday.)