Remploy workers in the region are striking in protest over the closure of 27 factories including those in Ashington, Newcastle and Spennymoor.
The company provides work for people with disabilities.
A Remploy spokesman said they are concerned that industrial action could deter possible buyers and current contracts at other sites.
More top news
Forecast for the week ahead
Officers attended the scene where a man had suffered a head injury. He was taken to hospital where is condition is described as critical.
Walkers set out from Ipswich on Easter Monday to walk 333 miles home in memory of Lee Hope, a Firefighter from Newcastle who died last year