SEATTLE (AP) — The U.S. has recorded nearly 20 mass killings so far this year, the majority of them domestic violence attacks that receive scant national attention compared to high-profile public shootings in recent years at schools, churches and concerts.

A database compiled by The Associated Press, Northeastern University and USA Today shows that the number of mass killings has held steady in 2019 compared with past years. But if the trend continues, the year could end with a lower death count because there have been fewer mass-casualty attacks such as those in Las Vegas, Parkland, Florida,...