Police fire may have hit hostage

An injured hostage is carried from the Lindt Cafe.Photo / AP

Australian police are reportedly investigating whether one of the victims wounded in the Lindt cafe siege was hit by a police bullet.

The Australian reported one of the hostages, who has not been identified, suffered wounds consistent with a bullet ricochet rather than a blast from Man Haron Monis' shotgun.

Three hostages were wounded when police stormed the Martin Place cafe shortly after 2am on December 16, killing Monis to end the 16-hour siege.

Cafe manager Tori Johnson, 34, and 38-year-old lawyer Katrina Dawson were also killed during the siege's bloody conclusion.

The three wounded hostages were reportedly told not to discuss what happened inside the cafe as the NSW investigation continues.

It is believed Johnson died when Monis, who had grown increasingly agitated, fired his shotgun at close range.

The Tactical Operations Unit then smashed the cafe's windows to target the gunman.

Dawson was fatally wounded shielding a pregnant hostage from the firefight.

Australian media this week reported Monis had become obsessed with Channel 7, particularly its breakfast programme Sunrise, after a 2007 interview that he believed incited terrorism. Channel 7's studios are directly opposite the Lindt cafe.

Meanwhile, an extra 3000 police officers will be on Sydney's streets on New Year's Eve to ensure revellers feel safe after the deadly CBD siege.

NSW Police Assistant Commissioner Mick Fuller said there would be more than "3000 additional police out to ensure New Year's Eve is a safe and family-friendly event".

"We'll see police in the air, on the waterways to make sure Sydneysiders feel extremely safe."