A second childcare centre in Sydney has been damaged by fire just days after another was deliberately set alight in a suspected firebombing attack.

Emergency services were called to the Play and Learn centre on Excelsior Avenue in Castle Hill about 1.30am on Monday following reports of a blaze. Fire crews quickly extinguished the flames, which caused only minor damage to the building. No injuries were reported.

NSW Police confirmed a crime scene has been established, with detectives investigating the circumstances of the incident.

“Officers attached to The Hills Police Area Command have established a crime scene and are investigating the circumstances surrounding the incident,” police said in a statement.

Authorities are now probing whether the Castle Hill fire is linked to a suspicious blaze at another Play and Learn facility in Turramurra last Friday.

In that incident, emergency services responded around 4.25am to find the centre engulfed in flames. Investigators believe a group of masked men broke through the front door, poured petrol inside the foyer and set it alight.

The Turramurra centre also suffered minor damage, but the chilling nature of the attack has left staff and parents reeling.

“No words, I’m just in shock. It just really hurts,” Play and Learn head of operations Jemma Quinlan told 9News after the Friday fire. “At the crux of it, we’re here to serve the community and today we can’t.”

The Turramurra centre was declared a crime scene and closed for the day. Parents were left shaken by the news.

“I’m feeling a little bit scared, what is happening here,” said parent Princi Chauhel.

Police and forensic teams are continuing to investigate both incidents. Anyone with information is urged to contact Crime Stoppers.

Images: 7News