Carlos Tovar, a contractor in charge of cleanup, left, hands out a warning notice to a resident of the Silicon Valley homeless encampment known as The Jungle, Monday, Dec. 1, 2014, in San Jose, Calif. City officials began posting notices on hand built structures, tents and tree trunks warning the 200 residents of what is likely the nation's largest homeless encampment that the bulldozers are coming. People living in the Silicon Valley camp must be out by Thursday, Dec. 4 or face arrest for trespassing. (AP Photo/Marcio Jose Sanchez)

SAN JOSE, Calif. (AP) — Police and social services in Silicon Valley are starting to clear away what likely had been the nation's largest homeless encampment.

Animal control and a construction contractor are also helping dismantle the square-mile site that once was home to more than 200 homeless people, San Jose homelessness response manager Ray Bramson said.

People living in the camp, known as The Jungle, were told Monday they must be out by Thursday or face arrest for trespassing. The encampment stands in stark contrast to its surrounding area in the heart of the Silicon Valley, a region leading the country for job growth, income, innovation and venture capital.

In a walkthrough earlier this week, officials found there were 60 people left in the camp. They didn't know how many remained after Monday.

Officials will try to find people who have been involved in social services some kind of shelter for the night. Bramson says those not involved in social services "are going to have to leave today anyways."

There have been no reports of violence or people refusing to leave.

The team will first go through the hand-built structures and tents looking for cash, IDs or anything else of value. Those items will be sorted and stored for people to claim later.

In the past year and a half, the city of San Jose has spent more than $4 million on solving the problems at the encampment.

The last time officials cleared out the camp was in May 2012 when about 150 people were moved out of The Jungle.

Bramson said earlier this week that increased violence, wet weather and unsanitary conditions make it imperative the camp is cleared. In the last month, one resident tried to strangle someone with a cord of wire down there, he said. Another was nearly beaten to death with a hammer. And the State Water Resources Control Board has been demanding that polluted Coyote Creek, which cuts through the middle, get cleaned out.

City officials plan to send in trash trucks and bulldozers to haul out tons of hazardous and human waste. They will use heavy machinery to fill excavated sections where people have been living underground. And they will try to restore the creek beds.