GRAND RAPIDS, Mich. (WOOD) — Three people, including a child, were pronounced dead after being found unresponsive on Grand Rapids’ south side Thursday.

It happened on Brookshire Drive north of 33rd Street in the West Millbrook neighborhood. Someone called 911 around 9:53 a.m. after the three were discovered in a car.

The Grand Rapids Fire Department said emergency responders tried CPR but it was not successful.

The cause of the deaths is not yet known. The Grand Rapids Police Department, which has taken over the investigation, said it was “way too soon” to know whether any foul play may have been involved.

GRPD was not yet prepared to release the names or ages of the dead, saying it was still confirming identities and notifying family.

Anyone with information about the deaths is asked to call GRPD at 616.456.3400 or Silent Observer at 616.774.2345.