SEATTLE -- Doctors at Harborview's Injury Prevention and Research Center say gun safes and other locking mechanisms may be the most effective way of preventing mass shootings.

"One concrete step we can take as a community is to lock it up," said Dr. Monica Vavilala, director of the center. "We can make recommendations for safe storage. Keep your gun locked up."

Dr. Vavilala made that recommendation when asked about Harborview's position on mental health and gun violence.

"There's no strong relationship between mental illness and mass shootings," said Dr. Vavilala, who emphasized doctors do not fully understand what triggers people to commit mass shootings. "We don't really know."

"Most people with mental health problems don't go out and commit mass shootings."