FACEBOOK / GETTY A man went berserk in a hospital screaming "Allahu Akbar" and threatening to behead a doctor

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Dr Attila Tan, from Bonn, had just returned to work after a holiday when he was set upon by the crazed father of a 19-year-old he treated. The teenager, who had previously fractured his leg, came back to the German hospital on Monday complaining of the treatment he had received. He demanded further medical care from Dr Tan, complaining about pain he said he was suffering from. Dr Tan, a 54-year-old surgeon, said: "The patient came in around 10am, he was accompanied by his girlfriend who wore a veil.

"He was radiating aggression that only intensified when I treated him. “I explained everything to him, including the exercises he should be doing. But he wasn't listening." The irate teen stormed out of the office shouting insults, only to return with his 45-year-old father and younger brother, 15.

GETTY The doctor’s loyal wife was beaten as she tried to help her husband

The dad brought with him a 30cm ‘Rambo’ knife. Dr Tan’s wife, 54, who works at the hospital reception, screamed for help when she saw the blade. In surgery when the trio burst in, the medic rushed towards the front desk and met the knife-wielding attacker head on.

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While trying to hold him down, Dr Tan recalled: “The father screamed at me: 'apologise to my son, go down on your knees and kiss his hand'. "The younger son then grabbed me from behind and tried to push me down.” He said it felt like the attacker was getting ready to behead him.

FACEBOOK The medic rushed towards the front desk and met the knife-wielding attacker head on.

The doctor’s loyal wife was beaten as she tried to help her husband and suffered a heart attack during the ordeal and had to be rushed to receive medical treatment. Dr Tan said: "She just wanted to protect me. The way he hit her, it hurts so much." The remaining staff and patients barricaded themselves in a visiting room and called the police.

An employee said: "The father came in saying 'where is that son of a bitch? I will kill him'. “We then pulled out something resembling a machete. "In the meantime we heard screams and things being thrown around.

NC He said it felt like the attacker was getting ready to behead him

“Then they screamed Allahu Akbar three times, in that moment I thought it was all over. “I thought he had killed Dr Tan and his wife.”