Militants kill four polio workers in Pakistan

Officials says three women and their driver were killed in the most deadly attack on health workers in two years.

Blood spattered shoes and papers after gunmen kill three female polio workers and their driver in Pakistan.

Wednesday's attack is the deadliest on the health workers in two years.

Polio workers blame the government.

(SOUNDBITE) (Urdu) UNIDENTIFIED POLIO WORKER, SAYING:

"Polio is not getting eradicated; only our people are getting wiped out."

Polio workers are often targeted by Taliban militants. They say the campaign to immunize children is a cover for Western spies -- or an effort to sterilize children.

Polio cases hit a 15-year high in Pakistan this year. The disease, which can kill or paralyze a child within hours of infection, has been eradicated everywhere else, except for Nigeria and Afghanistan.