HORRIFYING footage lays bare the utter terror unfolding inside a school in Crimea as a deranged 18-year-old slaughtered fellow students with a pump action shotgun.

Video shot on a fleeing teenagers' mobile phones eerily captures the terrifying moments Vladislav Roslyakov stalked his college halls before turning his gun on himself.

Today the shocking toll has become clear, with a total of 20 killed and 68 injured in the bomb and shooting carnage yesterday at the college in the Black Sea city of Kerch.

Five students are in comas after the attack and their condition is described as “extremely grave”.

Among the dead - mostly students aged between 15 and 19 - were a mother and daughter, Svetlana and Anastasia Baklanova, aged 57 and 26.

Acts of heroism also emerged, with teachers diverting Roslyakov’s attention to allow youngsters to escape.

Teacher Vladislav Miroshnikov revealed adults at the college in port Kerch “sacrificed their lives” to allow students to flee amid scenes of panic as the killer stormed the college.

Residents of the Black Sea city of Kerch brought flowers and toys to a makeshift memorial outside the school this morning.

Many were in tears and struggled to speak.

CCTV footage has come to light showing the chilling moment Roslyakov bought his ammunition.

It is believed he bought 150 cartridges for his Turkish-made Hatsan Escort pump action shotgun.

The teenager is seen in the video in a weapons’ shop in Kerch.

Reports say he held the weapon legally after undergoing legal, medical and psychiatric tests.

It has also emerged that Roslyakov was obsessed by the Columbine massacre and wanted to take his revenge out on his teachers.

Teachers and classmates described the attacker as a shy man and a loner.

CCTV Russian TV interviewed a friend of the killer who said he "hated the technical school very much because of the evil teachers...he hinted that he would take revenge on them”.

Stills from a video camera showed he wore black trousers and a white T-shirt, clothing that resembled the outfit worn by the Columbine high school attacker Eric Harris.

The 1999 high school massacre has led to dozens of copycat attacks and plots in the US and abroad.

Terrorism was initially blamed but Russian officials later reclassified the bloodbath as a "mass murder".

Sergei Aksyonov, the regional leader in Crimea, said yesterday the fourth-year student at the school had acted alone.

But today Mr Aksyonov says authorities were looking for a possible accomplice in the shooting.

Mr Aksyonov said: "The point is to find out who was coaching him for this crime.

"He was acting on his own here, we know that.

"But this scoundrel could not have prepared this attack on his own.”

The committee said all the victims died of gunshot wounds in the 15 minute murder spree.

Officials said an "unidentified explosive device" was detonated at the technical college in Kerch, close to where a new bridge linking Crimea to mainland Russia has been built.

Most of those injured were badly wounded by shrapnel which was packed around the explosive with the intention to maim.

Health Minister Veronika Skvortsova said today: "The kids' muscles have been minced with small metal objects.

"Those who have their organs ripped apart, we are finding metal balls in kidneys, intestines, in blood vessels.

"That is how powerful the blast was."

A second bomb found on the killer was later disarmed.

One pupil, called Sergei, aged 15, said: "I arrived at the hospital, the scene there was awful. They're bringing in people all covered in blood, some with arms missing, some with legs missing."

Sources revealed Roslyakov’s nurse mother Galina was treating wounded ferried from the attack to a local when she learned her son was responsible.

A local source said: "She is confused and cannot explain her son's motives.”

Police arrived to interrogate her and she was said to have left with detectives.

One survivor of the attack said she was lucky to escape with her life.

She told RT: “My friend was killed right in front of me. I saw her fall and simply stop moving. I saw boys dropping dead and blood spilling around.”

Student Semyon Gavrilov said: “I looked outside the classroom and there was a guy with a gun shooting everyone.

“I locked myself in the classroom hoping he wouldn't hear me. Ten minutes later the police with machine guns arrived.

“Four windows have been blown out in the corridor where the explosion was. There were bodies of the dead on the floor. The walls were charred.”

Anastasia Yenshina, a 15-year-old student at the college, told Reuters: "I came out and there was dust and smoke, I couldn't understand, I'd been deafened.

"Everyone started running. I did not know what to do. Then they told us to leave the building through the gymnasium.

"Everyone ran there... I saw a girl lying there.

"There was a child who was being helped to walk because he could not move on his own. The wall was covered in blood.

"Then everyone started to climb over the fence, and we could still hear explosions. Everyone was scared. "People were crying."

The director of the school, Olga Grebennikova, described the scene she saw when she entered the college building after the attack.

She said: "There are bodies everywhere, children's bodies everywhere. It was a real act of terrorism. They burst in five or 10 minutes after I'd left. They blew up everything in the hall, glass was flying.

"They then ran about throwing some kind of explosives around, and then ran around the second floor with guns, opened the office doors, and killed anyone they could find."

Vladimir Putin described the killing spree at the schoo for 850 teengers as a "tragic event".

Kerch is the entry point to Crimea from a bridge built between the peninsula and Russia.

Crimea was annexed by Russia from Ukraine in 2014 following a disputed vote which was condemned by Western powers.

Some Russian sources accused Ukraine of being behind the attack - despite there being no evidence yet of any such involvement.

Close Putin ally senator Franz Klintsevich, a member of the Russian upper house security and defence committee, said: “I don’t think that the hand of ISIS is able to reach Kerch.

“It is all more like a Ukrainian imprint. It can be…crazy nationalists, who are ready to do anything, in their hate to Russia.”

The speaker of the Russia-backed Crimean parliament, Vladimir Konstantinov, also suggested Ukraine may have been responsible for the attack.

He said: “The entire evil inflicted on the land of Crimea is coming from the official Ukrainian authorities".

Russia is notorious for spreading misinformation and propaganda about Ukraine.

After the attack, local officials declared a state of emergency on the Black Sea peninsula that Russia annexed from Ukraine.

They also beefed up security at a new 11.8-mile bridge linking the peninsula with Russia, which opened earlier this year.

Military units were deployed around the college to help emergency agencies.

Guns are tightly restricted in Russia. Civilians can own only hunting rifles and smoothbore shotguns and must undergo significant background checks.

Roslyakov received a permission to own a shotgun and bought 150 cartridges just a few days ago, according to local officials.

It was the greatest loss of life in school violence in Russia since the Beslan terrorist attack by Chechen separatists in 2004, in which 333 people were killed during a three-day siege, many of them children, and hundreds were wounded.