A four-year-old girl has undergone surgery for 'horrific' injuries after she was snatched from the streets of a New Delhi slum and raped by two men at knife point.

The girl was found after the attack by her parents - unconscious, suffering from severe injuries and dumped beside train tracks.

Vijay Singh, a senior police officer investigating the case, said police were questioning two men, though no arrests had been made.

Despite the protests which stemmed from the gang rape and murder of a student in 2012 and creation of tougher anti-rape laws, incidents of the crime in the capital have not dwindled.

Despite demonstrations and tougher laws, incidents of the crime in the capital (pictured) have not dwindled. File image used

Pictured are a group of protesters demanding justice following the death of a gang rape victim in New Delhi in 2012

He said: 'We are questioning the men in our custody and trying to help the victim's father obtain best medical care for the child.'

The child's grandmother told the BBC: 'What happened to us was reprehensible.

'We are worried about our children. We do not let them out for fear they might be taken away by unknown men.'

It is the latest case of sexual violence to shock the country. Two months ago, a pair of sisters were sentenced to be raped as punishment for their brother running away with a married woman.

The barbaric punishment was handed down in Baghpat district, Uttar Pradesh - about 30miles north of New Delhi.

One of the woman was aged just 15, while her older sister was 23. The sentenced was decided by a unelected all-male village council.

India's supreme court has described such bodies as 'kangaroo courts' and branded their decrees illegal, yet in some states they continue to operate and their punishments are often carried out.