Crozer Health's closing is already impacting emergency medical services in Delaware County, with first responders sounding the alarm.

The layoff of 2,651 Crozer employees is expected to start Friday, as Delaware County’s largest health system closes quickly amid the bankruptcy of its for-profit owner, Prospect Medical Holdings.

Crozer-Chester Medical Center is home to the Crisis Center, which provides critical round-the-clock intervention and treatment to adults and children experiencing mental health episodes. The flagship hospital is also home to the Community Campus, which delivers outpatient drug and alcohol treatment, along with mental health care.