Image: 7 News Sydney

A toddler has died after being found in a car in Sydney’s south-west.

At about 3.30pm yesterday, family members began a frantic search after discovering the boy couldn’t wasn’t inside their home on Ohagan Street at Chester Hill.

They found the 22-month-old unresponsive in the family car and phoned Triple Zero.

Chester Hill: A one-year-old boy has died after he was found unconscious at a home. Emergency services were called to Ohagan Street around 3:30pm this afternoon but the child was unable to be revived. #ChesterHill #7News pic.twitter.com/GnfwLrvsux

— 7 News Sydney (@7NewsSydney) February 3, 2019

Temperatures were in the mid 30s at the time and the car would have been significantly hotter.

When paramedics arrived they commenced CPR but couldn’t revive the toddler.

Police are now investigating the exact circumstances surrounding the boy’s death, including why he was in the vehicle and how long he’d been there.