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A smirking student 'armed with a circular saw' murdered his teacher before snapping a selfie with the dead body.

It is believed that the bandana-wearing teenager also used a knife to slit the throat of the 44-year-old health and safety lecturer at a polytechnic in the Russian capital before killing himself .

An electric saw was discovered at the scene, according to a Russian news outlet with close links to law enforcement.

It is unclear so far if the saw was definitely used by 18-year-old student Andrey Emelyannikov in the attack.

Gruesome pictures show a huge amount of blood on the floor under murdered teacher Sergei Danilov.

"The murder happened during a break when few people were inside a polytechnic college building," reported news outlet Mash.

(Image: east2west news)

"The victim [teacher] and the murderer [student] bodies had identical wounds.

"Next to them were found an electric saw.

"There was a knife on a desk close to bodies."

The student's body was undiscovered at first but later found under a desk.

It was not seen at first by a teacher who discovered the scene from hell.

The carnage was at the Western Complex of Continuous Education on Gvardeiskaya Street in Moscow.

(Image: east2west news)

The dead teacher was a father of three children, the youngest a daughter aged one.

The killer student posted a song called November's Doom - and pictures of the dead teacher.

After this he is reported to have killed himself.

Emelyannikov was said to have skipped classes for two weeks.

Reports say the teacher had warned him about expulsion for missing classes.

(Image: east2west news)

An unnamed student said of the teacher: "He was a very kind person.

"He was strict, but he was fair. He was like a father to us.

"I have no single bad thought about him.

"Regardless of what was happening, he was our support, he always tried to help us.

"If we ran into problems with teachers, he always tried to build bridges and help find compromise."

All witnesses say that there was not a single scream from the auditorium and that no-one walked out of it.

The boy's mother said her son had no conflict with the teacher.