The package was addressed to German Finance Minister Wolfgang Schäuble.
After examining the package, police did not rule out that it could be dangerous.
According to Bild newspaper, the package contained an explosive.
A bomb squad X-rayed it and took to a safe location for closer inspection, the Berlin police said on Twitter.
"An initial inspection of the object conducted in morning … showed the package contained so-called a firecracker mix that is often used in pyrotechnic production," police said, adding the package could have injured people if opened.
Due to the fact that it was impossible to fully examine the package at the site, it was transported for further inspection to a special training ground in Grunewald.
Further investigation is underway.