NSW Police have advised that a woman has been taken into custody in Coonabarabran after two children were found dead today, Monday 5 May.

Police attended a home in Coonabarabran just after 2pm today following reports of a 'concern for welfare'.

Upon arrival, police located two boys - aged 6 and 7 - deceased inside the home.

The woman – aged 66 – was arrested at the scene and taken to hospital for further assessment where she remains under hospital guard.

The woman and children are known to each other.

A crime scene has been established.

There is no ongoing threat to the community. Police are not looking for anyone else.

NSW Premier Chris Minns has released a heartfelt comment in the wake of the discovery.

"What has occurred is terrible and and a state we share in the community of Coonabarabran's grief at the loss of two young boys who had their entire futures ahead of them," he said.

"I cannot begin to image the heartbreak their loved ones are currently feeling, including their family, friends and teachers.

"I thank the local officers who attended the scene for their professionalism and bravery in the face of such a terrible event."

Officers from Orana Mid-Western Police District are now investigating the circumstances of the deaths under Strike Force Darnum, assisted by detectives from State Crime Command’s Homicide Squad.

Anyone with information about this incident is urged to contact Crime Stoppers: 1800 333 000.

Information is treated in strict confidence.

The public is reminded not to report information via NSW Police social media pages.