The cancellation of a crucial exam held earlier in May for admission to medical colleges over allegations of a paper leak has sparked protests in the Indian capital, Delhi.

The National Eligibility cum Entrance Test (Undergraduate), known as NEET-UG, is the gateway to studying medicine in India and is required for joining medical colleges across the country.

Nearly 2.28 million candidates wrote the exam on 3 May at more than 5,000 centres across India.

But within days, allegations of a paper leak sparked anger among students and parents, with protests and political backlash mounting through the week.

On Tuesday, the federal government's National Testing Agency (NTA) - which conducts the exam - said that based on its findings and an ongoing investigation, "the present examination process could not be allowed to stand".