Analysis of footage taken in the critical moments before police stormed the ­Martin Place cafe in the early hours of Tuesday recorded two shots.

The first shot was registered just after 2.04am and is believed to have been a warning fired into a door by gunman Man Haron Monis as a group of hostages broke for freedom from the cafe.

Armed police officers point as they stand at the ready in Martin Place. Picture: AP Source: AP

Then there was silence for nine long minutes. Police officers who had moved into position outside the cafe, with guns at the ready, moved back.

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At 2.13am a second shot was fired and a sniper in the Channel 7 building ­opposite is reported to have said: ­“Window two, hostage down.”

That is believed to have been when cafe manager Tori Johnson was shot.

Picture: Daily Telegraph Source: Supplied

Police then put at least two flash bang stun grenades into the cafe before ­storming in. Channel 7 reporter Chris Reason has reported Monis screamed at police when they burst in.

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“We’ve been told in those terrifying seconds that the police stormed into the Lindt cafe, Haron Monis was heard to scream ‘Look what you’ve made me do!’ before the police shot him down,” Reason said.

Why police waited nine ­minutes before storming the building will form part of the coronial inquest.

The sniper stationed in Channel 7 studios at Martin Place during the siege. Source: Channel 7

Meanwhile, security footage has emerged which is believed to show Monis calmly walking through Martin Place an hour before the hostage drama began.

Channel 7 has released security footage from its inner-city studio camera to police which shows a man believed to be Monis strolling up and down Martin Place ­wearing a backpack.

The grainy footage was taken at 8.30am, just over an hour before the siege began.

Detectives were yesterday ­examining the footage to try to determine Monis’ movements ­before he locked the doors to the Lindt cafe.

Police snipers move to take up positions around Martin Place. Picture: Richard Dobson Source: News Corp Australia

It is understood Monis may have spent some time before the siege sipping coffee inside the cafe before deciding on the exact time to launch his attack.

All things considered, NSW Police Commissioner Andrew Scipione said the Lindt cafe siege would have been a bloodbath if officers had not gone in when they did.

Police snipers had gunman Monis in their sights but had not taken the shot for fear of wounding a hostage.

Armed officers were forced to storm the Martin Place cafe after Monis fired his pump-­action shotgun and killed manager Tori Johnson.

Police Bomb Squad officers at the scene. Picture: Bill Hearne Source: News Corp Australia

Mr Scipione said the police action had saved lives. “I truly believe [the siege] would have been a bloodbath,” he said.

Police had been happy to negotiate due to uncertainty around a string of terror tactics Monis had put in place to mislead and confuse authorities.

“Making his backpack look like a bomb was quite clever because it meant the authorities had to take that into account,” terrorism expert Clive Williams said.

Monis had wires coming from the backpack and convinced hostages it contained explosives.

What looks to be a robotic device police intended to use during the siege. Picture: Bill Hearne Source: News Corp Australia

Police tacticians had to allow for the possibility it might contain a dead man’s switch that would automatically detonate if he was shot.

Police later found the backpack contained nothing but an old stereo speaker.

“If he had a bomb and had blown up the hostages it would have been much worse,” Professor Williams said.

Monis had the hostages standing with their hands up in front of the cafe windows as a human shield but he was still visible to the sniper positioned in the Seven building.

A sniper sets up near Martin Place. Picture: Don Arnold/Getty Images Source: Getty Images

“You would not take him out with a sniper because you have to allow for the effect of the glass on the bullet. There was no guarantee that it would not hit a hostage,” Prof Williams said.

Monis used the hostages to increase confusion by posting bomb claims on social media.

“All of these factors mean the police would want this to take the path of negotiating a resolution.”

He said every one of Monis’s actions was designed to create maximum publicity.

Prof Williams said police had now gone on to full alert with the high visibility Operation Hammerhead to deter any copycat attacks.