Official: Washington School Shooter Lured Targets to Lunch

Still don't have motive for the shootings, though.

MARYSVILLE, Wash. -- Investigators say that a gunman responsible for a shooting at a Washington state high school on Friday invited his victims to lunch by text message.

Snohomish County Sheriff Ty Trenary told a news conference Monday the five students were all at a lunch table when they were shot by 15-year-old Jaylen Fryberg.

Trenary also confirmed that the .40-caliber handgun used in the shooting had been legally purchased by one of Fryberg's relatives. It remains unclear how Fryberg obtained the weapon.

The sheriff said investigators continue combing through a massive amount of text messages, phone records and social media posts as they search for an explanation for the shooting - but he also says they may never find one.