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The crazed killer who murdered at least nine people in a chilling massacre may have lured people to their deaths with a fake Facebook post offering free meals.

Police said they were examining a "game" on the social network that asked people to be at the branch of the fast food chain where Friday's murderous rampage began in order to get free food.

The chilling detail was revealed in a press conference in the wake of the attack which left 10 people - including the 18-year-old Iranian-German gunman - dead.

When opening up the conference to questions, one reported asked: "On Facebook there is a type game whereby at 4 o'clock in the afternoon you should be meeting in McDonald's because something ... I believe this is a fake game where people are asked to congregate at McDonald's because McDonald's might be offering free meals."

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Munich police president Hubertus Andrae replied: "As to whether this may be connected with the crime we have to investigate that.

"At the moment it's simply impossible to say that. It is one part of the rather comprehensive investigation that we are conducting with the federal police forces."

(Image: Imago / Barcroft Media) (Image: Getty) (Image: Getty)

The mayhem began in a branch of McDonald's at around 5.50pm where the teenage killer opened fire on people before going outside and continuing to fire on terrified passers-by.

Shocking footage showed the moment the gunman pulled out a handgun and began firing at a group of people as they walked towards the fast food restaurant.

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According to investigators, he then crossed the road and went into the Olympia Einkaufzentrum (OEZ) mall and continued firing at people.

He is then said to have tried to flee the scene, but was shot at by a plain clothed officer before managing to give police the slip.

His body was then discovered several hours later in a side street from the mall where it is believed he shot himself dead.

(Image: Getty)

(Image: Getty) (Image: Universal News & Sport (Europe))

Officers revealed a further three people were currently fighting for their lives in the attack which left a total of 16 people injured.

In the press conference, police president Andrae confirmed that "adolescents" were among the dead and "children" among the injured.

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It was originally feared there were three gunmen on the loose as armed police swarmed the area looking for killers but hours later officers confirmed the final body found was that of the gunman.

The killer, who has not yet been named, was revealed to be an 18-year-old German-Iranian who had live in Munich for "more than two years".

He began his murderous spree in McDonald's where a horrified mother told how she was in the bathroom with him as he loaded his gun before he started shooting.

She told CNN: ""My son saw in the toilet the man loading his gun. It was a pistol."

The terrified woman added: "That's where he loaded his weapon.

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"Boom, boom, boom, I heard, and then I saw all the injured. I was back to back with him, I was in the bathroom with my kid, and I only saw him shoot directly into the faces of children.

The children were sitting to eat. They can't run."

She added that she heard the gunman say: "Allahu Akbar" - 'God is great' and an Islamic phrase often used by jihadis .

(Image: Getty)

"I know this because I'm Muslim. I hear this and I only cry," she said.

ISIS-related social media accounts have been sharing reports of the attack, but reports in German newspaper Bild suggests right-wing extremists are responsible.

Investigators said there was no immediate clear motive for the attack and that they could not say it was "terror" until they began examining evidence from his home.