A 93-year-old man is in custody accused of stabbing his elderly wife in a mid-morning attack inside a shopping centre in Sydney’s west.

Police were called to the Westpoint Shopping Centre in Blacktown just after 10am Sunday following reports a 79-year-old woman had been stabbed multiple times with a kitchen knife.

WATCH THE VIDEO ABOVE: Elderly man arrested after shopping centre stabbing

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It is understood the woman tried to escape into The Reject Shop while being attacked.

Shopping centre security were on the scene quickly, and the woman was taken to Westmead Hospital where she remains in a critical condition.

Her 93-year-old husband was arrested and taken to Blacktown Police Station, where he remains.

7NEWS understands investigators are waiting for a translator before they can formally interview him.

Witnesses described the shocking scene at the busy shopping centre.

“Terrifying,” one shopper said. “I’m glad I wasn’t here earlier.”

“[I’ve] Just [seen] police around, security. I think I’ve seen some forensics inside taking photos.”

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