A member of the Pakistani security services stands guard while a health worker administers a polio vaccine to a child, near the Afghan border in Chaman. Four health workers were killed by armed militants in Quetta on Wednesday, bringing the total number of polio health workers targeted in Pakistan to 65 since December 2012.

AFP/Islamabad

Pakistan police arrested three men for beating up two polio vaccinators in the eastern city of Lahore, officials said on Friday, the latest case of violence against health workers seeking to immunise children against the crippling disease.

A scuffle broke out when two polio vaccinators visited the family's home for a second time on Thursday to double check that they hadn't missed any children out of the polio immunisation campaign. The health workers and the men of the house got into a fight after the family said there were no children at home, a local police official said.

Police officer Mohammad Kamran said that police arrested three men on the complaint of the polio vaccinators after about 60 health workers held a protest outside the police station.

The three men - from the low-income Siddique Colony neighbourhood of Lahore - were arrested but later released on bail.

"Since beating someone is a bailable offence, the trio was released on bail later," Kamran told AFP.

Mohammad Usman, the supervisor of the vaccination team, said that the men became irritated because the health workers knocked on their door twice in the same day when there weren't any children in the house.

Gunmen on Wednesday killed four members of a polio vaccination team in the outskirts of Quetta, the capital of southwestern Baluchistan province.

Pakistan is one of only three countries where polio remains endemic. Attempts to stamp it out have been badly hit by opposition from militants and attacks on immunisation teams, which have claimed more than 60 lives in the last two years.

The militants have in the past claimed that the polio vaccination is a cover for espionage or a Western conspiracy to sterilise Muslims.

Officials say the number of polio cases recorded in Pakistan has reached 246 for the year - a 14-year high and more than double the total for the whole of 2013.

Among the new cases detected, 136 are in the troubled northwestern tribal areas at the border with Afghanistan, the stronghold of Taliban and Al-Qaeda militants.

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