A 6-year-old boy’s body was found late Monday in Oregon’s icy Yaquina Bay after a woman told police she threw her son from a bridge.

Newport Police Chief Mark Miranda said the woman called 911 about 6:30 p.m. local time, “saying she threw her child over the side” of the Yaquina Bay Bridge in Newport, Ore., some 130 miles from Portland. KPTV reported police detained her for questioning and expected to arrest her during the night.

The Coast Guard searched the water for hours in two vessels and a helicopter before finding the body, Coast Guard spokesman Jonathan Klingenberg told CNN. Local search-and-rescue teams also aided in the search.

The body was found floating near a marina.

“The fire department got there first and recovered the body,” Klingenberg told NBC News. “It’s absolutely a tragedy. Most of us all have families.”

Miranda told CNN the chances someone would survive the more than 100-foot fall to the water were “minimal.” And if someone lived through it, the frigid water could kill him within about 20 minutes.

A woman in Portland named Amanda Stott-Smith tossed her 4-year-old son and 7-year-old daughter from a bridge in 2009. Though her daughter survived, her son died. Stott-Smith was sentenced to 35 years in prison, Fox News reported.