The arrest of Brad Lander was the latest case in which an official has been held while protesting President Trump’s immigration agenda.

Officials said that the body was spotted in Olympic National Park in Washington State on Monday, but that it was pinned behind a surge of water and was hard to reach.

The plot, described by one official as being “as serious as it gets,” involved a plan to shoot moviegoers at a Washington State mall as they fled an explosion.

Their bodies were found near the summit of Mount Katahdin, at the end of the Appalachian Trail, officials said, after a search that began on Monday.