In a shocking statistic, medical sources reported that about 5,200 prisoners die annually in a prison near the Philippine capital Manila, due to overcrowding, violence and the spread of diseases.

The overcrowding causes tuberculosis, for example, to be unimaginable, CNN quoted the director of medical affairs at the New Belepid Prison Hospital in Montenlopa, just outside Manila.

He said conditions inside the prison were dire, with prisoners being crammed into dilapidated cells and hardly any place to sleep, adding that 85 prisoners were being held in a cell measuring about 60 square meters.

According to "CNN", this problem is not limited to this prison, but other prisons across the country face the same problem.

The network quoted observers as saying that this overcrowding is an expected impact of the war on drugs by President Rodrigo Duterte.

Thousands of people have been killed in the government's anti-narcotics campaign, which police estimate has killed 3,500 people, while rights groups say the death toll is 13,000.

The Philippine president has ordered the security forces to fire in the context of combating the drug trade in the country, which drew sharp criticism from human rights organizations accused him of "crimes against humanity."