A nurse said that she interviewed gunman Adam Lanza four times in 2006 and 2007 and that he had been diagnosed with obsessive compulsive disorder. The advanced-practice nurse prescribed an antidepressant/anti-anxiety medication, but said Lanza's mother, Nancy Lanza, stopped giving it to him after he was unable to raise his arm and failed to schedule follow-up visits. Peter Lanza said his son was a "happy kid" when he was 8 or 9 and a student at Sandy Hook, but when he turned 11, he seemed "stressed and frustrated." A former teacher said Lanza's parents were not "up front" with teachers about his mental abilities. She recalled Lanza responding to a writing assignment by "obsessing about battles, destruction and war," to a degree she called "disturbing." A man who had dated Nancy Lanza said she told him via e-mail that she had scheduled a trip to London the week of the shooting but canceled because of "last minute problems on the home front." Children were later interviewed only if they or their parents requested. After the interview, the children were given a copy of A Terrible Thing Happened to help them process what they had seen.