The shots were fired from the window of a unit above a shop during the near-two-hour standoff. Photo: Sitthixay Ditthavong/AAP PHOTOS

Investigators are still trying to work out what drove a gunman to indiscriminately start firing on a suburban street, leaving one person seriously injured and sparking a shootout with police.

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A 60-year-old man is expected to be charged with a number of firearm offences on Monday, accused of peppering the busy shopping strip with bullets and forcing a Sydney suburb into an hours-long lockdown on Sunday night.

Shattered glass and bullet hole-riddled wi

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