A government campaign to vaccinate 40 million children under the age of five against polio had to be suspended following serious attacks on workers and police in just one week. A policeman protecting polio workers was killed in Bannu, and a polio worker was injured with a knife in Lahore by a man refusing to allow his child to be vaccinated. Two others connected with different polio teams were also killed, and one man was seriously wounded. Further attacks on staff in Sindh, Balochistan and Punjab were reported. The violence was preceded by a series of rumours intended to derail Pakistan’s campaign to eradicate the disease. On 22 April several thousand children were taken to hospital in north-west Pakistan by panicked parents after a video circulated on Facebook in which a man attested that children were falling sick following vaccinations. A mob set alight a health centre following the same rumour.