Police say the South Korean-born suspect in a deadly shooting attack at a small Christian university had been upset because he was teased about his poor English skills.
Oakland Police chief Howard Jordan said on Tuesday that the teasing was one motivation for 43-year-old One Goh's shooting rampage at Oikos University in California.
Monday's attack killed seven people and wounded three others.
Jordan earlier said Goh was targeting a female administrator at the school, where he was expelled for possible behavior problems.
Jordan says Goh appears to have planned the attack for several weeks.