Police Find 'Very Good Evidence' on Gunman The massacre of 26 children and adults at a Connecticut elementary school elicited horror and soul-searching around the world even as it raised more basic questions about why the gunman, a 20-year-old described as brilliant but remote, was driven to such a crime and how he chose his victims. Investigators were trying to learn more about Adam Lanza and questioned his older brother, who was not believed to have been involved in the rampage at Sandy Hook Elementary. Police shed no light on the motive for the second-deadliest school shooting in U.S. history. In tight-knit Newtown on Friday night, hundreds of people packed St. Rose of Lima Church and stood outside in a vigil for the 28 dead - 20 children and six adults at the school, the gunman's mother at home, and the gunman himself, who committed suicide. People held hands, lit candles and sang "Silent Night." "These 20 children were just beautiful, beautiful children," Monsignor Robert Weiss said. These 20 children lit up this community better than all these Christmas lights we have. ... There are a lot brighter stars up there tonight because of these kids. Lanza is believed to have suffered from a personality disorder and lived with his mother, said a law enforcement official who was briefed on the investigation. Across the street from the elementary school in Sandy Hook, Conn. neighbors hoisted an American flag and created a make-shift prayer for the deceased inside the school late Friday Dec. 14, 2012. (AP Photo/Robert Ray) Close Asked at a news conference whether Lanza had left any emails or other writings that might explain the rampage, state police Lt. Paul Vance said investigators had found "very good evidence" and hoped it would answer questions about the gunman's motives. Vance would not elaborate. The tragedy plunged the picturesque New England town of 27,000 people into mourning. People in my neighborhood are feeling guilty about it being Christmas. They are taking down decorations," said Jeannie Pasacreta, a psychologist who volunteered her services and was advising parents struggling with how to talk to their children. Lanza shot his mother, Nancy Lanza, drove to the school in her car with at least three of her guns, and opened fire in two classrooms around 9:30 a.m. Friday, law enforcement officials said, speaking on condition of anonymity. A custodian ran through the halls, warning of a gunman, and someone switched on the intercom, perhaps saving many lives by letting them hear the chaos in the school office, a teacher said. Teachers locked their doors and ordered children to huddle in a corner, duck under their desks or hide in closets as shots reverberated through the building. Among those killed was the school's well-liked principal, Dawn Hochsprung. Town officials said she died while lunging at the gunman in an attempt to overtake him. A woman who worked at the school was wounded. Maryann Jacob, a clerk in the school library, was in there with 18 fourth-graders when they heard a commotion and gunfire outside the room. She had the youngsters crawl into a storage room, and they locked the door and barricaded it with a file cabinet. There happened to be materials for coloring, "so we set them up with paper and crayons." After what she guessed was about an hour, officers came to the door and knocked, but those inside couldn't be sure it was the police. "One of them slid his badge under the door, and they called and said, 'It's OK, it's the police,'" she said.