Extinction Rebellion (XR) activists have delayed the distribution of several national newspapers after blocking access to three printing presses owned by Rupert Murdoch.
More than 100 protesters targeted Newsprinters presses at Broxbourne in Hertfordshire, Knowsley in Merseyside, and near Motherwell, North Lanarkshire.
Newsagents said some of the papers – which XR accuse of failing to report on climate change – have arrived late.
Seventy-two people have been arrested.
The Sun tweeted saying copies of the paper would be delayed arriving at newsagents, adding the blockade was an “attack on all the free press”.
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The presses print the Rupert Murdoch-owned News Corp titles including the Sun, the Times, the Sun on Sunday, the Sunday Times, and the Scottish Sun. They also print the Daily Telegraph and Sunday Telegraph, the Daily Mail and Mail on Sunday, and the London Evening Standard.
XR used vehicles along with individual protesters chaining themselves to structures to block roads to the presses.
Vans were covered with banners including “Free the truth” and “Refugees are welcome here”.
Newsprinters also condemned the protests as an “attack on all of the free press”, which it said had affected workers going about their jobs and others such as newsagents who faced “financial penalty”.
“Thanks to other industry partners, printing was transferred to other sites,” it said.
Hertfordshire Police said officers were called to Great Eastern Road near the Broxbourne plant at about 22:00 BST, where they found about 100 protesters who had “secured themselves to structures and one another”.
And Home Secretary Priti Patel tweeted the overnight action by XR was an “attack on democracy”.
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By 06:00 BST, 13 arrests had been made with police expecting more to follow, but delivery lorries had still been unable to leave the site to distribute papers.
Officers in Hertfordshire said by about 09:30 42 people had been arrested.
Merseyside Police tweeted on Saturday morning officers were still at the Knowsley plant.
Officers said the site had been cleared of protesters by about 10:30 and 30 people had been arrested on suspicion of aggravated trespass.
Police Scotland said in a statement the protest at the Eurocentral plant near Motherwell “was peaceful and there were no issues”.
XR has accused the newspapers and their owners of “failure to report on the climate and ecological emergency” and “polluting national debate” on dozens of social issues.
The Federation of Independent Retailers condemned the demonstrations, saying members left without supplies of papers were having “to deal with angry customers who are unable to get their daily newspaper”.
National president Stuart Reddish said it also meant retailers were unable to get papers to elderly and vulnerable customers.
“Newsagents have played a critical role during Covid-19 in getting newspapers into the hands of readers and this is not helpful at a time when every sale counts,” he added.
Extinction Rebellion has planned 10 days of action and demanded the government declare a climate and ecological emergency.
On Thursday, more than 300 people were arrested during protests in central London.
Meanwhile, climate change protesters have been warned they risk large fines if they fail to comply with coronavirus rules banning gatherings of more than 30 people.
A procession of activists that set off walking from Brighton a week ago is due to march the final stretch to Parliament later.
The Met Police said risk assessments of the march in Westminster “did not meet the required standard” and have banned XR from taking a 20ft model boat named after teenage activist Greta Thunberg to the streets of Westminster.