Protesters have smashed windows at a factory owned by a Israeli military technology company and covered it in red paint.
Palestine Action activists have also blocked Greenacres Road with a caravan and chained themselves to the vehicle, as well as gates at the Ferranti Technologies building.
Campaigners have been there since around 6.30am this morning (Monday August 23).
The site is owned by Elbit Systems, which produces specialist electrical equipment for military use.
Elbit Systems purchased Ferranti Technologies in 2007 for £15m.
On its website, Ferranti Technologies is described as ‘an electronic engineering and manufacturing company, specialising in supplying the aerospace and defence industry with a wide range of advanced technology for air, land and marine applications’.
In recent months, there have been a number of protests at the building, including a 200-strong event in May.
A spokesman for Palestine Action confirmed that this is the sixth time the Oldham factory has been closed down in the past year.
The group was founded in August 2020 and Elbit sites across the UK have been occupied by protesters three times this month.
A spokesman for Transport for Greater Manchester (TfGM) said: “Greenacres Road, Oldham. Road is closed in both directions between Heywood Street and Brideoak Street due to a Police incident.
“@FirstManchester diverting via Huddersfield Road.
“Allow an extra time for your journey.”
Greater Manchester Police have been approached for comment.