'She would never open the door in the middle of the night in these circumstances, so who did?': Intrigue grows as police investigators probe Kim robbery 

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Investigators are baffled as to who opened the armoured door to Kim Kardashian’s luxury apartment before she was robbed at gunpoint in the early hours of Monday morning.

While detectives are satisfied that the robbers could have easily tricked their way into the palatial apartment block in Paris, it is not clear how they got into her actual flat.

‘This is the baffling part of the enquiry,’ said a source close to the investigation. ‘The door is armoured and easily locked from the inside.

‘We are dealing with a young woman who was sleeping alone with a hugely valuable amount of jewellery.

‘She would never open the door in the middle of the night in these circumstances, so who did?’

Kim Kardashian, pictured here on Sunday just hours before the raid, was sleeping alone in her apartment when the men entered through her armoured front door 

It is claimed that the reality 35-year-old reality TV star pleaded for her life after the gang got into her bedroom and held a gun against her head.

She was then tied up by two men wearing police armbands who took the valuables and then apparently disappeared without trace.

There are conflicting reports that a stylist called Simone Harouche was also staying in the apartment, but did not know anything about the attack until afterwards.

This rules her out as the person who may have let the gang in, and there is no sign of forced entry of any doors in the building.

French police officers stand in front of Kim Kardashian's luxury apartment Hotel de Pourtales on Rue Tronchet in the 8th arrondissement, where she was robbed at gunpoint by masked men

Detectives are satisfied that the robbers could have easily tricked their way into the palatial apartment block in Paris. However, it is not clear how they got into Kim's actual flat

Pictured is one of the luxurious main rooms in the complex where Kim Kardashian had millions of dollars worth of jewellery stolen by five armed masked men dressed as police officers. The Eiffel Tower can be seen from the window 

Detectives admit that the high-profile crime is one of the strangest they have had to deal with in recent years.

They assumed that Ms Kardashian would have been surrounded by her own private security guards, and that she would never have kept such valuable jewellery with her while sleeping alone.

There is also concern that Ms Kardashian effectively fled France within a few hours of the robbery – heading back to the USA on a private plane on Monday morning.

She gave a statement to police, but in normal circumstances the victim of such a serious crime would be expected to be interviewed at length by both police and prosecutors.

Police have also made much of the fact that the attackers focused on ‘possessions that had been seen and noticed via social media.’

Four days ago, Ms Kardashian posted a close-up photograph of a huge diamond ring on her left hand captioned with three diamond emojis.

Two of five suspects forced their way into the apartment, close to the British Embassy in Paris, according to city prosecutors.

Just an hour or so before the robbery, Kim posted a video on Snapchat that showed her wearing the engagement ring (left). She posted a video of herself FaceTiming with Blac Chyna during a baby shower with Rob Kardashian

Ms Kardashian, a mother of two, is said to have shouted ‘Please don’t kill me, I have children,’ before she was tied up, gagged, and dumped in a marble bath.

The concierge of the building also suffered a similar fate, and was later found on the stairwell of the apartment block.

This means that neither of the two known victims would have been in a position to call the police.

Stylist Ms Harouche may have raised the alarm, after hearing a commotion, but this has not been confirmed.

Whatever the case, the five-member gang was apparently so relaxed that some of them made their escapes on hire bicycles known as velibs following the 2.30am crime.

Just days before the attack, Ms Kardashian heaped praise on her German bodyguard, Pascal Duvier, after he protected her from a notorious celebrity prankster who tried to kiss her buttocks while she was entering a restaurant.

Kim Kardashian was accompanied by her assistant and personal bodyguard as she rushed on to a waiting plane on Monday morning after being robbed at gunpoint

Kardashian's main bodyguard Pascal Duvier - who was not with her at the time of the robbery - returned to New York on Monday

Kim was pictured without her ring as she arrived back in New York and was reuinted with husband Kanye West on Monday after fleeing Paris

But Mr Duvier was apparently out at a nightclub with other Kardashian family members on the morning of the crime.

Hours before the raid she posted a photograph of her with Mr Duvier on Twitter, captioned: ‘This guy is always in my shot!’

Numerous theories about the gang have been put forward, including that they are ‘Pink Pathers’ – a notorious organised crime syndicate made up mainly of Eastern European gangsters.

But the Panthers are known for escaping the scene of their crimes in high-end sports cars, rather than bicycles.

Jeanne d'Hauteserre, the mayor of the 8th arrondissement in which Ms Kardashian’s flat is situated, said it was more that a local gang was involved.

He said: ‘There have been a number of attacks in recent times, notably of watches, and then of people attacked in their own apartments.’

Mr d'Hauteserre added: ‘Now that this is all a big news story, we hope that the famous gang or gangs will be dismantled and arrested.’