UPDATED: 10:09 p.m., Monday:

A fifth body was found in the Morrisville apartment, 6abc reporter Dann Cuellar tweeted.

A source told LevittownNow.com that the bodies were found after a welfare check by a county agency.

Original Post:

Morrisville and Bucks County authorities were investigating the death of four people found inside an apartment.

The bodies were located inside a ground-floor unit at the Robert Morris Apartments on West Bridge Street in the borough late Monday afternoon.

Morrisville Chief of Police George McClay said there were no obvious signs of trauma and fire crews did not detect high levels of hazardous materials upon entrance. The deceased were of varying ages, although the chief did not release them.

A neighbor said he witnessed medics taking two people from the scene in ambulances. McClay confirmed one person was taken to the hospital after suffering seizures and the other person was taken after being dazed.

Bucks County Detectives were on the scene.

The Bridge Street neighbor said he saw the Morrisville Fire Company and the Bucks County Hazardous Incident Response Team at the apartment complex.

As the sun was setting, officers and county detectives were roping off the apartment.