The pigs have been raised by children as young as four since the beginning of the school year.
A police officer said he was ‘lost for words’ following the incident in Norwich.
Footage obtained in an undercover investigation by charity Animal Equality shows farm workers kicking and prodding the pigs with pitchforks.
The majority of the pigs survived the incident, and the driver was taken to hospital.
A female pig left abandoned in a field for months is enjoying the trappings of a local celebrity after being housed and fed by residents.
Up to 900 pigs have been killed after a fire tore through a building in Dorset.
Firefighters tackled the blaze for three hours yesterday at Seaborough Manor near Beaminster.
Investigators are now looking into the cause of the blaze, which swept through the roof of the 330ft-long piggery.
Nearly 3,000 pigs – many of them diseased – have been found in a major water supply to Shanghai in China.
The news, confirmed by official media, is said to have triggered a public outcry as concerns mount over food safety and environmental pollution.
Some of the pigs were infected with porcine circovirus (PCV) virus, the Shanghai Agriculture Committee admitted, but insisted that the disease would not infect humans.