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on Tuesday targeted members of teams in eastern , killing at least four staffers, officials said.

No militant group immediately claimed responsibility for the attacks in the city of Jalalabad. Along with the four killed, at least three members of the polio vaccination teams were wounded, said DrÌýJan Mohammad, who coordinates the anti-polio drive for the country's east.

Afghanistan and neighbouring Pakistan are the only two remaining countries in the world where polio is endemic, after Nigeria was last year declared free of the virus.

In March, the Islamic State group said it shot and killed three women who were part of a polio vaccination team, also in Jalalabad, the capital of Afghanistan's Nangarhar province.

The IS affiliate is headquartered in eastern Afghanistan and while the Sunni militant group's numbers are believed to have gone down after recent government offensives and clashes with the rival Taliban, IS militants have lately stepped up attacks on minority Shiite Muslims.

IS has also taken responsibility for several targeted killings that have taken aim at the country's nascent civil society, as well as journalists and legal professionals.

Though struggling with a new, third surge in coronavirus cases, the Afghan government has in recent months sought to inoculate 9.6 million children against polio with the help of UNICEF. In 2020, Afghanistan reported 54 new cases of polio.

The increased violence and chaos comes as the USÌýand NATO are completing their military withdrawal from Afghanistan. The estimated 2,500-3,500 US soldiers and 7,000 NATO allied troops are to be gone by 11 September at the latest, though there are projections they may be gone by the middle ofÌýJuly.

The UK's decision to cut funding for the Global Eradication Initiative by 95 percent was revealed in a leaked memo. 👇

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Though not uncommon in Afghanistan, attacks on polio vaccination teams are more frequent in Pakistan, where the Pakistani Taliban and other militants regularly stage attacks on polio teams and security forces escorting them. They also target vaccination centres and health workers, claiming that anti-polio drives are part of an alleged Western conspiracy to sterilize children or collect intelligence.

Last week, two policemen who were providing security to polio vaccinators were shot and killed in northwest Pakistan.

These attacks increased after it was revealed that a fake hepatitis vaccination campaign was used as a ruse by the CIA in the hunt for Al-Qaeda leader Osama bin Laden. Bin Laden was killed by US commandos in 2011 in Pakistan.