A NATO airbase in the German city of Geilenkirchen was closed on Wednesday morning due to suspicions that acts of sabotage had taken place there, a spokesman for the German Armed Forces Territorial Command in Berlin said.
A similar incident had earlier occurred at the Bundeswehr barracks in Cologne.
German authorities have closed a military base in Cologne while investigating possible contamination of the water supply.
A spokesman for the German Defense Ministry confirmed on Wednesday that an investigation was underway at the barracks over suspected of sabotage, Reuters reports.
The incident in Geilenkirchen was first reported by Sueddeutsche Zeitung.
The base, located next to Cologne Airport, is home to the German Air Force command, which is responsible for, among other things, the aircraft used to support the travel of Prime Minister Olaf Scholz and other cabinet members.
During the inspection, a hole in the fence was reportedly discovered and water samples were taken, as there was a suspicion that the water supply could be contaminated.
Thousands of people at the base, which houses 4,300 troops and 1,200 civilians, have been ordered to stay in and out of their barracks and advised not to drink tap water while police, military police and military intelligence investigate.
A spokesman for the territorial command in Berlin confirmed to Reuters that the base had been closed, saying the army was taking the matter seriously.
There is no word on who may have gained illegal access to the Cologne base. NATO leaders have previously warned of a campaign of hostile activity orchestrated by Moscow, including acts of sabotage and cyber-attacks.
In addition to Germany, Britain, Poland and the Czech Republic have reported incidents in recent months.
In July, NATO Secretary General Jens Stoltenberg said the alliance saw a pattern in the events. He stressed that the latest attacks were consequence of the activation of Russian intelligence.
Prepared by: Sergey Daga