Taliban denies killing three female Afghan polio workers

Murders of two volunteers and a nurse come one day after relaunch of national vaccination campaign

Two female volunteers and a nurse working door to door to vaccinate children against polio were shot dead by gunmen in two separate incidents in the Afghan city of Jalalabad on Tuesday.

On the same day, government officials confirmed that an explosion had rocked Jalalabad's health ministry headquarters but no casualties were reported.