My every sympathy to the two families concerned here and to their friends and colleagues also. What is happening over in London/the UK? I agree with Rhett Winthorp-St Gery that French police should be welcomed over to the UK by the London police to ensure a thorough and meaningful investigation.

Mick, Cork, Ireland

What underlies this tragedy? A negligent and self-satisfied government, oblivious to the need for public security, and instinctively inclined to appease criminals. They will make victims of us all.

Derek, Taunton, UK

I am just so shocked by the news of the murder of these two young men - guests in our country. It feels like a line has been crossed. London seems savage and out of control. How do we look their families in the eyes when they come to indentify what is left of two talented, good young men?

Jane , Surrey, Surrey

Beyond the horrednous tragedy of these murders, it's sad to see that racism is alive and well in Britain: both this article and the BBC mention a "white male" running away from the scene. Had he been black we all know nothing would have been said. Then he just would have been " a youth". Pathetic.

Bertie, London,

Theft of computer did not give some key to their research. The thieves came back & tortured them with knives. Did they get what they needed? Bio-engineering co's in similar fields may conduct industrial espionage.

Warren, Lyon,

That's it, another tragic and senseless death in London and the midia is using it in the most sensacionalistic way: it will become a circus.

This is disgusting.

Fabio C, London, UK

I was a French Student from Poytech Nantes, And i can't stop thinking about this tragedy!!

My thought go out to the family and their girlfriends!!

Jerome T., Leamington,

The UK is sick, I'm afraid.

Phil, Bishop's Stortford, UK

Horrific.

Totally separate to other knife crime incidents however: this appears to be the premeditated act of torture by psychotic(s).

It brings to mind the Michael Haneke film 'Funny Games'.

PD, Scotland,

Such a waste of two promising lives who would have undoubtedly contributed to positively to society. My thoughts & prayers are with the families & friends. I hope that those responsible are caught in good time. It saddens me to see just how awful the UK is becoming.

Mal, Essex, UK

I cried when I read this. My heart goes out to his girlfriend and their families. Lives are destroyed so easily, those of the dead and those they left behind.

Lucy, Coventry,

What a grotesque distortion Nulabour have made of society. This kind of savagery is becoming commonplace as their statistics, of which any Ministry of Propaganda would be proud, assure us that all is well. The police, emasculated and useless, are as much of a threat to me as any drug-crazed thug.

Jacques Francis, westcott, UK

Such a terrible loss of life. My thought are with the familes. how can you even begin to comprehend this horrific murder.

Anne-maire, Hampton, VA, USA

We are all smaller.

London is descending into hell.

At least the Nazis put on uniforms, developed technology, and fought formally; they were easy to deal with in comparison to that which we now certainly face.

Stephen , London,

What a dreadful waste.
I dont see how the government on their own can stop this - surely we as parents have to make our children into better citizans that dont think stabbing people is acceptable? That combined with much harsher sentencing is the only thing I can think of.

annie, Mansfield, England

What can anyone say - this is just too terrifying to even imagine. My thoughts and prayers go out to their families. I feel so ashamed of what this country has become. This evil person must be caught before it happens again. RIP.

pauline, ashford , kent

I hope the London Metropolitan Police and Scotland Yard spare no efforts to apprehend the killers. They should welcome bringing in two French detectives to make sure that all possible connections and evidences are explored.

People who do this need to be removed to prison for life.

Rhett Winthrop-St.Gery, Ecorse, Michigan, USA

Yet another tragic waste of life.
I doubt anyone in France or anywhere else for that matter will still believe the comments from the British Police Commisioner and the Home Sec that knife crime is reducing in the UK and is no worse than it was in the past !!

KeithW, Wirral, UK