BERLIN (Reuters) - German judges and state prosecutors need to crack down straight away on fake news disseminated through social media platforms such as Facebook, Germany’s Justice Minister Heiko Maas said in an interview published on Sunday.

A man is silhouetted against a video screen with a Facebook logo as he poses with a Samsung S4 smartphone in this photo illustration taken in the central Bosnian town of Zenica, August 14, 2013. REUTERS/Dado Ruvic/File Photo

Maas, a Social Democrat in conservative Chancellor Angela Merkel’s coalition, has repeatedly warned the U.S. technology company to respect laws against defamation in Germany that are more rigid than in the United States. He told the Bild am Sonntag newspaper the principle of free speech did not protect against slander.

“Defamation and malicious gossip are not covered under freedom of speech,” Maas said, just days after other top government officials called for legislation to tackle “hate speech” and fake news on Facebook and other social media platforms.

“Justice authorities must prosecute that, even on the internet,” he said, noting that offenders could face up to five years in jail. “Anyone who tries to manipulate the political discussion with lies needs to be aware (of the consequences).”

The issue of fake news has taken on new urgency after warnings by German and U.S. intelligence agencies that Russia has sought to influence elections and sway public opinion.

German government officials have expressed concern that fake news could influence the parliamentary election expected in September, in which Merkel will run for a fourth term.

Germany’s strict libel and slander laws are meant to protect citizens by making it a crime to defame others. More than 218,000 cases involving insults were filed with prosecutors in 2015. But few internet cases were prosecuted.

Maas said he wants to change that: “We need to fully utilize all the legal authority at our disposal,” he said.

Fears of fake news ahead of the election have increased after the head of Germany’s domestic intelligence agency, Hans-Georg Maassen, reported a rise in Russian propaganda and disinformation campaigns aimed at destabilizing German society.

“Facebook is earning an awful lot of money with fake news,” Maas told Bild am Sonntag. “A company that earns billions from the internet also has a social responsibility. Prosecutable defamation must be deleted immediately, once reported. It needs to be made easier for users to report fake news.”

On Friday, the parliamentary floor leader for Merkel’s conservatives, Volker Kauder, said the government wanted to introduce a law in early 2017 that would require social media firms to set up local offices to respond faster to complaints.

Facebook Inc FB.O said on Thursday it would take measures to prevent fake news spreading.