In short:

Detectives are yet to interview a 60-year-old man who allegedly opened fire on a street in Sydney's inner west.

A man in his 50s was left injured and has undergone emergency surgery for gunshot wounds to his neck and chest.

The alleged gunman had no known mental health history, according to police.

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Acting Superintendent Stephen Parry said between 50 to 100 shots were fired "indiscriminately" at passers-by over a two-hour period.

The 60-year-old had no connections to organised crime or terrorism, police said.

Acting Commissioner Trent King said the shooting did not appear to be drug or alcohol-related.