Four people were found dead Wednesday morning inside an apartment building in the Bronx, law enforcement sources said.

The bodies were discovered around 9:45 a.m. at the Castle Hill Houses on Lacombe Avenue, the sources said.

All four people were pronounced dead at the scene; the city’s medical examiner will determine their causes of death.

Law enforcement officials were conducting a sweep of the area for any video related to the incident.

This story is developing.