A man has been arrested after an active shooting in a busy Sydney suburb that saw at least one person shot, numerous people injured and multiple cars fired upon by a gunman.

As many as 100 shots rang out over a two hour window between 7.45pm and 9.30pm on Sunday night in Croydon Park, in Sydney's inner west.

Streets were closed and the area was placed in lockdown as police launched a major operation after reports a man was indiscriminately firing at innocent motorists, including police cars, travelling along Georges River Road.

Described as an 'active shooting situation' by NSW police, Tactical Police Unit were called in to arrest a 60-year-old man from a unit above a business along the busy road.

Acting Superintendent Stephen Parry told reporters it is unclear exactly how many shots w

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