Berlin police were not immediately available for comment.
On Sunday police said they arrested the man and five co-conspirators and foiled an alleged plot meant to inflict horror.
The security authorities said that on that basis and after a deadly van rampage on Saturday in the western German city of Muenster, they made a decision to swoop on the suspects.
Berlin Mayor Michael Mueller thanked security forces for preventing an "impending attack with their vigilance and police work".
The police declined to give further details as their inquiries are ongoing.
Berlin's top security official, Andreas Geisel, had said that the city of 3.5 million people would need to review its precautions for the half marathon following the Muenster attack in which two people were killed.
The newspaper reports the men have suspected links to a Tunisian man who killed 12 people in the city in a December 2016 truck attack.
The race was guarded by more than 630 police officers and went off undisturbed.
Authorities have said the attacker was a 48-year-old German citizen with mental health problems and that there was no indication of an Islamist militant connection.
He was shot dead by Italian police in Milan, Italy, four days later while on the run.
In its unsourced report, Die Welt said the main suspect was known to Amri and had planned to stab to death spectators and runners at the half-marathon.
Die Welt reported that the main suspect, who was not identified, had prepared two knives to use in the attack.
The other three suspects also had links to Amri, according to Die Welt.
Germany has been on high alert for a terrorist attack on a large sporting event since a football friendly against the Netherlands in Hanover was called off...
Police in Germany have detained four men, one of whom was suspected of planning knife attacks at the Berlin half-marathon on Sunday.