Ms Adomeit went on to say there was no indication the perpetrator had any political motives for the attack.
Special police forces detained four men in connection with the race plot, the paper said - different from the six that police reported.
The driver committed suicide inside the van, police said. "We are on site", the police tweeted. They then told local authorities at the man's other homes in Dresden and Pirna in eastern Germany about the note, but he could not be found there either.
Bode said six of the 20 injured were in severe condition.
The prosecutor's statement said no one was detained during the raids.
Asked about a motive behind the attack, German Interior Minister Horst Seehofer said in a press conference Sunday that the man, who has not been named, could have been mentally ill.
His run-ins with the law regarded threats, property damage, fraud and a hit-and-run, but Ms Adomeit said all charges were dismissed.
Muenster Police President Hajo Kuhlisch said the man's four apartments - two in Muenster and two in Saxony - and several cars had been searched thoroughly.
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The Muenster University Hospital put out an urgent call for citizens to donate blood - and so many people rushed to help that long lines of donors formed. He, Laschet and Reul laid flowers in central Muenster and paid their respects to the victims of the attack. Twelve people, including the man driving the truck when it was hijacked, were killed.
The impact of the crash was so violent that the van did not stop until it hit the pub's stone wall. The German news agency dpa reported that witnesses spoke of two others in the van besides the driver.
The police have discovered a moulage of the AK-47 rifle and fireworks at the house of the 48-year-old perpetrator of the ramming attack that occurred in Germany's Muenster yesterday, a joint statement issued by the city's Prosecutor's Office and the police says. "The investigations are being led under high pressure in all possible directions".
The authorities identified the two fatal victims of Saturday's crash as a 51-year-old woman from Lueneburg County of and a 65-year-old man from Broken County. Their names weren't given, as is customary in Germany.
Inside the van, police found the gun he used as well as illegal firecrackers disguised as a fake bomb and an imitation pistol.
Lino Baldi, who owns an Italian restaurant near the scene of the crash, told Sky TG24 that the city center had been packed with people out enjoying a Saturday market and summer-like temperatures, which had risen to 25 degrees Celsius (77 degrees Fahrenheit) from just 12 degrees (54 degrees F) a day earlier.
An unknown number of Dutch nationals were also injured in the melee, officials said.