A Detroit woman was stabbed to death inside a city home while paramedics were in the next room treating an elderly heart attack victim, according to news reports.

EMS and fire crews were in the Arizona Street home Saturday night performing CPR on the patient when an unidentified knife-wielding assailant burst in, WDIV-TV in Detroit reported.

The attacker grabbed a 35-year-old woman who was also in the home and pulled her into a nearby bedroom, where paramedics said they could hear a violent struggle.

They called for police backup, but the assailant stormed out of the house — still clutching the knife and covered in blood — before police arrived, the report said.

Both the stabbing victim and the heart attack patient, described as a man in his 60s, died at the scene.

In a statement Sunday, the Detroit Firefighters Association, the department’s union, said it was “thankful for how our fire/medics handled this active situation keeping our members from physical injuries.”

A spokesperson for Detroit police said Monday that the incident was still under investigation.