Twenty-seven people, including 20 children, are dead after a shooting at Sandy Hook Elementary School.

Another person was found dead at 36 Yogananda St. in Newtown, sources told The Courant, and the gunman was found dead inside the school.

The shootings at the school took place in two rooms, one of which is a kindergarten classroom, sources said. One entire classroom is unaccounted for.

Students described being ushered from their classrooms hand-in-hand, with their eyes closed, to the safety of a nearby fire station as police converged on the school. Anguished parents rushed to the scene.

State police sources told The Courant that the shooter is 20-year-old Adam Lanza. When he was found, he had his brother Ryan Lanza’s identification, which initially led to confusion about his identity, police said.

He was dressed in black fatigues, police said.

A law enforcement official said the boys' mother, Nancy Lanza, works at the school as a teacher. The Associated Press is reporting that she is presumed dead.

A grandmother of the suspect — who is also the mother of teacher believed killed — was too distraught to speak when reached by phone at her home in Brooksville, Fla.

“I just don't know, and I can't make a comment right now,” Dorothy Champion, 78, said in a shaky voice as she started to cry. She said she hadn't heard anything official about her daughter and grandsons. She declined to comment further and hung up.

The gunman drove to the school in his mother's car, an official said. Three guns were found — a Glock and a Sig Sauer, both pistols, inside the school, and a .223-caliber rifle in the back of a car.

President Obama, in an emotional address to the nation Friday afternoon, said "These neighborhoods are our neighborhoods, and these children are our children."

“I know there’s not a parent in America who doesn’t feel the same overwhelming grief that I do," he said. "The majority of those who died today were children, beautiful little kids between the ages of 5 and 10 years old. … They had their entire lives ahead of them. Birthdays, graduations, weddings, kids of their own." 

“Among the fallen were also teachers, men and women who devoted their lives to help their children achieve their dreams,” he said. 

Three people were brought to Danbury Hospital. Their conditions are not confirmed. The emergency room is on lockdown. 

State Police Lt. J. Paul Vance said two children died at a local hospital and another had injuries.

Shortly after 9:40 a.m., police reported that a shooter was in the main office of the school. A person in one room had “numerous gunshot wounds,” police said.

“A minute after our officers were there, they realized what a horrific scene we had there,” said Newtown Police Lt. George Sinko.

Once they know how serious the incident was, they called for help.

“This is most definitely the worst thing experienced here in town,” he said. “But for now, we’re concerned about the families of the victims.”

Groups of students — some crying, some holding hands — were being escorted away from the school by their teachers. Some students were still in the school at 10:30 a.m., parents said, as police searched the area.