The attacks also wounded three more women and a man in Peshawar, Nowshera and Charsadda in the Khyber Pakhtunkhwa province on Wednesday.

One of the lady worker is said to be critical due to bullet ripped into her head, doctors in Lady Reading Hospital said.

On Tuesday Over four health workers were shot dead during a nationwide polio vaccination drive.

The Taliban banned immunisations in the tribal region of Waziristan, condemning the campaign as a cover for espionage after the jailing of a doctor who helped the CIA find Osama bin Laden using a hepatitis vaccination programme.

Following the brutal attacks, A joint WHO-Unicef statement said such attacks “deprive Pakistan’s most vulnerable populations — especially children — of basic life-saving health interventions”.

“We call on the leaders of the affected communities and everyone concerned to do their utmost to protect health workers and create a secure environment so that we can meet the health needs of the children of Pakistan,” it added.

UN spokesman Martin Nesirky said UN chief Ban Ki-moon condemned the “senseless and inexcusable attack on health workers” and was to meet Pakistan’s UN ambassador Masood Khan on Tuesday over the issue.

US State Department spokeswoman Victoria Nuland also condemned the attacks, saying: “Any attack on health workers anywhere in the world is unacceptable.”