KANO: Gunmen killed at least nine people at two Nigerian polio clinics on Friday, with one of the wounded health workers describing a horrifying attack that saw them trapped by fire.

The attacks in the northern city of Kano came after a local cleric denounced polio vaccination campaigns this week and some local radio programmes repeated conspiracy theories about the campaigns being a Western plot to harm Muslims.

Such conspiracy theories have long spread in parts of Nigeria’s mainly Muslim north, stoked by local politicians. Nigeria is one of only three countries still considered to have endemic polio, alongside Pakistan and Afghanistan.

“Nine people were killed in two separate attacks by gunmen on (motorised) tricycles when they attacked two dispensaries where polio immunisation workers were preparing to go out for polio campaigns,” police spokesman Magaji Majia told reporters.

Police declined to say who they believed was behind the killings. Extremist group Boko Haram has carried out attacks in Kano, though gangs linked to local politics also operate.

“Six people on a tricycle pulled up outside the dispensary at 9:45 am while polio immunisation workers were gathering for the day’s house-to-house polio campaign,” a resident near the second attack said.

“Two of the men were holding guns. They stormed into the dispensary and began shooting.”

A victim in the first attack who was shot in the back said from her hospital bed that two gunmen stormed into the consultation room at the clinic where she and five other immunisation workers were seated and opened fire, killing two people.

They then set fire to a curtain in the consultation room, fled and shut the door behind them.

“We summoned courage and broke the door because we realised they wanted to burn us alive,” said the woman.

Speaking haltingly at Aminu Kano Teaching Hospital, she declined to give her name or age, though she looked to be in her 30s.

Three other wounded victims from the same attack had also been taken to the hospital, including one who was in emergency surgery.

Those killed in the first attack included a man and a woman, while the seven killed in the other attack were all women, according to residents.

Last year, two Nigerian police guarding polio vaccination workers were killed by gunmen, though it was unclear if the attack was linked to the campaign.