BERLIN — After allegations of Russian interference in the US elections, officials here fear that an attempt to undermine German democracy may be next.

Germany’s top spy cautioned Tuesday that Russian hackers may seek to disrupt national elections next year, a warning that comes a day after a massive cyberattack targeted the Internet routers of nearly 1 million Deutsche Telekom customers.

The German telecommunications giant was hit Sunday and Monday with what officials described as an ‘‘outside’’ hack. Government systems, German officials said, were not affected, but they were targeted by the attack, which tried to implant malware.

Asked whether the attack may have originated in Russia, as some analysts have speculated, German Interior Minister Thomas de Maizière told the DPA news service: ‘‘It is possible that the line between criminal activities from a particular country and state activities cannot be clearly drawn. . . . At this point, the origin is not clear.’’

But in an interview published Tuesday in the Süddeutsche Zeitung, Bruno Kahl, the head of Germany’s foreign intelligence service, raised serious concerns over the threat of cyberattacks either sponsored by or tolerated by Russia.

Asked about the charges by US security agencies — and denied by Moscow — that Russian hackers had tried to influence the US election through the spread of misinformation, Kahl said, ‘‘We have indications that it is coming from this direction, yes.’’

Washington Post