A 16-year-old student who set himself on fire at Standley Lake High School remained in critical condition Tuesday, as shocked students returned to the closed school to collect belongings and talk to counselors.

According to police and fire reports, the sophomore boy doused himself with an accelerant before lighting himself on fire in the school cafeteria about 7:15 a.m. Monday. A 1-gallon Coleman fuel jug was found at the scene, Westminster Fire Department spokeswoman Diana Wilson said.

The boy was burned over 80 percent of his body; about 40 percent of the burns are third-degree, she said.

Just before he lit the fire, the boy posted a suicide note on his Facebook page.

“This is not someone’s fault, I had this planned for years so shut your face if you think that this was because of something recent or because of someone,” he wrote. “There was nothing that anyone could have done.”

The Denver Post is not identifying the boy.

The school was evacuated and remained closed Tuesday, though students were allowed to return to get things they left behind during the emergency.

Ten counselors were on hand to help teens deal with the shock, Lynn Setzer, Jefferson County Public Schools spokeswoman said. “We brought in some extra from other schools in Jefferson County and from the Jefferson Center for Mental Health.”

Setzer said 75-100 students returned to the school Tuesday and everyone who wanted to talk to a counselor was able to do so.

Standley Lake High junior Emily Morin, 16, and other students made posters and asked for prayers for their classmate. She also has started an online fundraising account at YouCaring.com for the boy and his family.

“I didn’t know him personally, but he went to my school,” she said. “I knew of him and I just wanted to help him out.”

Classes will resume Wednesday and the school has ordered 1,500 T-shirts for students emblazoned with the slogan “Gator Strong,” a reference to the school’s alligator mascot.

Last September, for the first time in the history of Safe2Tell, an anonymous hotline where people can report threats against themselves or others, suicide threats were the top reported concern, with 49. Those numbers have remained high: 61 in November, and 64 in December, director Susan Payne said.

Any threat of suicide should be taken seriously and can be reported at 877-542-7233, she said.

“We want to make sure that everyone knows if there is a threat to take one’s life, call,” she said. “It is an urgent and immediate situation.”

Tom McGhee: 303-954-1671, tmcghee@denverpost.com or twitter.com/dpmcghee