Dramatic footage has emerged of horrified onlookers covered in blood and a suspect in handcuffs moments after a man was knifed in the head in front of children outside a McDonald's restaurant.

The victim, thought to be in his 30s, was brutally attacked on a busy high street in broad daylight and eyewitnesses described seeing 'blood everywhere'.

Several shoppers rushed to the injured man's aid, while other members of the public are said to have stopped his alleged attacker fleeing the scene.

Terrifying: Pictures have emerged of the moment horrified onlookers (left) rushed to the aid of a man who was knifed in the head in front of children and morning shoppers (right) outside a McDonald's restaurant

Detained: A spokesman for the Metropolitan Police confirmed one man was arrested by police after people in the street stopped the attacker fleeing. He is currently in police custody at a South London police station

He was arrested when police arrived and cordoned off the scene in Bromley, South London.

London Ambulance Service paramedics were called following reports of an assault at around 11.30am this morning.

A spokesman confirmed that multiple resources were sent to the scene and the victim was rushed as a priority to hospital.

His condition is currently unknown.

Video taken by a passer-by showed the victim, who appeared to have a bandage wrapped around his head, being tended to by shocked onlookers.

A spokesman for the Metropolitan Police confirmed that one man was arrested by police after people in the street stopped the attacker fleeing.

He is currently in police custody at a South London police station.

There was chaos after the incident before police arrived and cordoned off the scene in Bromley, South London

The attack happened at about 11.30am this morning and shocked onlookers rushed to help the injured man

The McDonald's restaurant was closed after the incident, which occurred right outside its front doors.

Passerby Laura Gooderham, 18, said: 'I just came out of the shopping centre and was walking along, heard loads of police sirens.

'The road was shut off and a police officer was holding a man on the ground.

'You could see blood on the pavement. Ambulances and police vans everywhere it was crazy.'

An eyewitness, who asked not to be named, told Mirror Online: 'It was completely manic. I was opposite McDonald’s waiting to go in when there was this sudden rush of people.

'I could hear a woman screaming at the top of her lungs. I carried on walking over, then I could see blood.

Concern: Panicked shoppers quickly came to help the victim, who was seen with a bandage on his head

Reaction: Members of the public took to Twitter to express their shock after hearing about the stabbing today

'It was on the pavement, and all over the woman, it was everywhere and I could hear more screaming.'

The eyewitness also told how 'there were lots of kids around' at the time of the stabbing.

Other members of the public took to Twitter to express their shock.

One wrote: 'Can't believe someone was stabbed outside where I work about an hour ago. Was at work when it happened.'

Another witness tweeted that she saw a woman 'screaming, crying with blood all over her'.