DAYTON—Law enforcement from across the region, including the Walla Walla SWAT team, descended on Dayton on the morning of April 25, in response to a report of an active shooter in the vicinity of Columbia County Transportation offices at 507 West Cameron Street in Dayton.

No firearms were ultimately found at the scene but Sherrad J. Lahd was later arrested and faces charges of second degree assault and unlawful discharge of a laser, for causing fear of imminent danger.

According to a Columbia County Sheriff’s Office press release, dispatch received a 9-1-1 call at 5:33 a.m. on the morning of A...