Ten people including the first officer who arrived, died in a mass shooting Monday at a supermarket in Boulder, Colorado.

The shooting, which took place at a King Soopers grocery store, marks the seventh mass killing of the year in the U.S. Police have arrested but not identified a suspect. The motive remains unknown.

Boulder County District Attorney Michael Dougherty said the suspect was the only person injured and was receiving medical care.

“This is a tragedy and a nightmare for Boulder County. These were people going about their day, doing their shopping. I promise the victims and the people of the state of Colorado that we will secure justice,” Dougherty said.

Hundreds of police officers from throughout the Denver Metro area responded to the attack, converging on the supermarket in the busy shopping plaza.

The end of jury selection is in sight in the trial of Derek Chauvin, a former Minneapolis police officer who is charged in George Floyd’s death.

Just one more was needed Tuesday morning ahead of opening statements next week, which are scheduled for March 29th. The current 14 jurors consist of five men and nine women, who range in age between their 20s and their 60s.

Twelve jurors will eventually deliberate, with two alternates.

COVID-19 cases rose at St. Thomas last week. The university’s Center for Well-Being announced 15 positive cases last week, compared to nine the week before.

Ten students and five employees are among the positive tests, with 14 from the St. Paul campus and one from the Minneapolis campus.

This is the third week in a row that cases have risen.

Molly Heimel can be reached at heim8394@stthomas.edu.