Top-two primaries — Oregon voters will get to decide in November whether to ditch Oregon’s partisan primary elections. State elections officials Tuesday certified a ballot measure that, if approved by voters, would create a top-two primary system. All candidates would appear on the ballot, and all registered voters would be eligible to participate. The top two candidates, regardless of their party affiliation, would advance to the general election.

Suspected arson in Medford — Authorities in Medford said they’re increasingly worried about a string of fires that may be the work of an arsonist. Police said 13 suspicious fires over the past three weeks may have started with the June 25 blaze that leveled a former fruit-packing plant downtown. Although that fire hasn’t been ruled an arson, police said there are too many similarities between it and a dozen other fires to ignore. The fruit-packing plant fire has been determined to be human-caused. Lt. Mike Budreau said the fires are being set from the exterior of buildings along alleys. Most have been set in the early morning. Police think the arsonist is traveling by foot. An owner said the building gutted in late June was worth an estimated $366,000.

Wandering toddlers — Police in the Portland suburb of Sherwood said they found two small children wandering outside unattended in 90-degree heat when they responded to a call. The 3-year-old boy and 2-year-old girl were being watched Monday evening by other residents in the area. Officers said the children were partly dressed and unkempt. Police said the children’s mother was found passed out in a nearby home. A police spokesman said bystanders cleaned up the children and gave them food and water and a change of clothes. They were then taken into protective custody. Officers arrested 34-year-old Mary Katherine Hilliker for investigation of criminal mistreatment and child neglect.

Minority school leaders — State officials in 2012 set a goal of adding 10 percent more minority principals and school administrators by 2015. A new state report shows Oregon schools appear to be nearing that goal. The Legislature set a goal to add 21 more black, Latino, Asian or Native American principals in the state’s more than 1,200 schools between 2012 and 2015. By this past school year, 18 had been added. About 35 percent of Oregon students are minorities, whereas 90 percent of the state’s public school teachers and administrators are white.