Shots fired in Sydney home invasion, man arrested

A man is in custody after gunfire erupted during a home invasion in Sydney's west overnight.

Just after 11.40pm, police were called to a home on Marsden Street in St Marys.

Officers were told a group of men had forced their way into the home, before firing a gun and threatening the occupants.

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None of the residents were injured.

The invaders fled before police arrived, but responding officers located a car travelling on Saddington Street, which crashed into a fence on the same street a short time later.

The occupants fled the crashed car, and a search of it afterwards found ammunition.

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Police then attended a unit complex where they arrested a 45-year-old man.

He was treated by paramedics and taken to hospital under police guard, with what police believe are injuries sustained during the crash.

The investigation is ongoing.

Anybody with information or relevant footage is urged to contact Crime Stoppers online or on 1800 333 000.