The body of Adam Lanza, who killed 27 people including 20 children in Newtown, Connecticut, has been collected by his family but not yet buried.
Earlier, Reuters news agency reported that the 20-year-old gunman had been buried in a private service.
The gunman who killed 27 people and himself in Newtown, Connecticut, was buried at a private service over the weekend, a spokesman for his father said.
Peter Lanza claimed the body of his 20-year-old son Adam, the spokesman added.
Connecticut's chief medical examiner released Lanza's body on December 27.
The day after the second-deadliest school shooting in US history, Peter Lanza said in a statement: "Like so many of you, we are saddened, but struggling to make sense of what has transpired."
Update: Reuters have issued a correction on this story. Adam Lanza's body has been collected but not buried.
The body of the man who killed 26 people at a Connecticut primary school has been claimed for burial.
Connecticut Medical Examiner Wayne H Carver II told the Hartford Courant the remains of Adam Lanza were claimed several days ago by someone who wanted to remain anonymous.
Twenty-year-old Lanza killed 20 first-graders and six members of staff at the Sandy Hook Elementary School in Newtown on December 14.
He also killed his mother, Nancy, at their home before going on the rampage and then committing suicide.
A private funeral for Mrs Lanza was held in New Hampshire earlier this month.
Teachers in the US state of Utah have been offered free training in handling guns in the wake of the deadly Newtown school shooting.
Gun-rights activists provided 200 teachers with six hours of training in the use of concealed weapons at an event on Thursday.
Kelly Hansen, a special education teacher from Salt Lake City in Utah, told Reuters, "I feel like I would take a bullet for any student in the school district".
"If we should ever face a shooter like the one in Connecticut, I'm fully prepared to respond with my firearm", she added.
The move comes after the National Rifle Association (NRA) proposed placing an armed officer at every school in the US following the deaths of 20 children and six adults at Sandy Hook Elementary School.
A $100 million claim on behalf of a 6 year old survivor is the first legal action to come out of the Sandy Hook elementary school shooting that left 26 children and adults dead two weeks ago.
The unidentified client, referred to as Jill Doe, heard "cursing, screaming, and shooting" over the school intercom when the gunman, 20 year old Adam Lanza, opened fire, according to the claim filed by New Haven-based attorney Irv Pinsky.
"As a consequence, the ... child has sustained emotional and psychological trauma and injury, the nature and extent of which are yet to be determined," the claim said.
A member of staff from Sandy Hook Elementary School in Connecticut has spoken of how her life was saved by a fellow staff member as a gunman fired shots at staff and pupils just over a week ago.
In total 27 people - including 20 children - were killed in the shootings. Twenty-year-old Adam Lanza killed his mother, attacked the school, then killed himself on December 14.
Becky Vigalla told Reuters she is " very proud to work at Sandy Hook School" and that "so many heroes were there that day."
The executive Vice President for US gun lobby the NRA has spoken on American television, repeating the NRA's belief that armed police should be posted in US schools following the Sandy Hook school shootings.
Speaking on NBC's Meet the Press, Wayne LaPierre said parents across America would feel better if armed police were stationed at their children's schools.
On Friday protesters interrupted the NRA's news conference, where the gun lobby outlined its plans to combat gun attacks in schools.
The CEO of gun lobby the National Rifle Association is today defending his comments after the Sandy Hook shootings. Wayne LaPierre says again gun control "won't work".
Speaking to NBC he says again "the only way to stop a bad guy with a gun is a good guy with a gun".
He says banning assault weapons and large magazines would NOT work in reducing mass shootings. The NRA head refuses to say he would support gun control.
So the NRA position is completely unchanged. No support for gun control, no banning assault weapons and no stronger background checks.
Supporters of more gun control says the position of the gun lobby the NRA is extreme and out of touch.
A candle-lit vigil has been held in Newtown, Connecticut to remember the 26 people killed in the Sandy Hook school shootings last week.