Two custodians were found shot to death Monday inside a Chicago elementary school after one of them allegedly killed his co-worker before turning the weapon on himself, according to reports.

Incident Details

A 48-year-old woman and a 63-year-old man were found unresponsive inside Mark Twain Elementary School just after 3:30 p.m., the Chicago Police Department said. Both were shot once in the head, authorities said. They were taken to local hospitals, where they were pronounced dead.

School principal Matthew Moline confirmed the deaths in a letter to parents, WTTW-TV reported. He said shots were fired inside the building at a time when no students were present.

SEIU Local 73, the union that represents Chicago Public Schools custodial employees, confirmed both unidentified victims worked at the elementary school.

The older custodian was upset that he was slated to be transferred from the school, the Chicago Sun-Times reported, citing a police report. He allegedly shot his co-worker before shooting himself, according to the newspaper.

Original reporting: Fox News (HLL/CB) — read the source article.