New Delhi: Of the 6,740 prisoners at Tihar Jail who were released on parole last year in the wake of the Covid-19 pandemic, 3,468 have gone “missing”. Jail authorities have now approached the Delhi Police to help trace them. Most of the convicts and undertrial prisoners suffering illnesses such as HIV, cancer, kidney dysfunction requiring dialysis, Hepatitis B or C, asthma and TB were released last year to decongest the prison as Covid cases rose. Tihar, with a cumulative capacity of holding 10,026 inmates, is one of the largest prison complexes in South Asia.