Demands to secure infrastructure in Germany after "sabotage" hit the train network

German officials have called for more protection of the country's key infrastructure, after major damage to wireless cables at two sites brought trains to a standstill in northern Germany for nearly three hours.

German officials called on Sunday to strengthen the protection of key infrastructure in the country, in the wake of major railway sabotage, in the atmosphere of war in Ukraine, pointing to the possibility of Russian responsibility for it.

"We cannot rule out that Russia was also behind the attack on the railway company," said German Green Party official and member of the government coalition, Anton Hofreiter, considering that the recent leakage of Nord Stream 1 and 2 gas pipelines in the Baltic Sea already bears "the hallmarks of the Kremlin."

"Perhaps in both cases it is a warning because we support Ukraine," the head of the German Parliament's European Affairs Committee added in an interview with the Funke media group. He called for the release of 20 billion euros to better protect critical infrastructure, strengthen police capabilities and ICT security.

German police have not yet released specific evidence after Saturday's "sabotage" of wireless transmission cables at two locations, which halted train traffic in northern Germany for nearly three hours.

The government spoke of an act of sabotage. "It is clear that this was a directed and deliberate act," German Transport Minister Volker Wessing said.

A senior German military official also issued a warning Sunday. "Every generator, every power station, every power transmission pipeline is a potential target," General Carsten Breuer said in the daily Bild, stressing the growing "hybrid threats".

The conservative opposition also called for a review of the security architecture in Germany and the European Union.

"The modern age of war requires the adaptation of our concepts," Thorsten Frey, an official in the party of former Chancellor Angela Merkel, told the RND newspaper.

German media confirmed that German investigators are convinced that Saturday's sabotage was carried out by professionals with inside information for the national railway company.

And the newspaper "Der Spiegel" that the Berlin police department, which is responsible for investigating actions that threaten the state, such as attacks and cases of espionage, is conducting the investigations.