A man has been rescued from a house where he was allegedly restrained and assaulted, as detectives searched for his suspected kidnappers.

Three people were arrested when police raided a house in Auburn, in Sydney's southwest, at 8pm on November 2 after the alleged kidnapping was reported to investigators.

The alleged victim, 42, was at his home in Riverwood at 8am on November 2, when a group of unknown people forced entry.

He was assaulted and taken from the house, police said.

Detectives launched an investigation into the alleged kidnapping, and police established a crime scene at the Riverwood house.

About 12 hours after the alleged kidnapping, investigators pinpointed a house on Susan Street in Auburn where they believed the man was being held.

Detectives arrived to find a 44-ye

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