German police on Wednesday found an "explosive" package at Finance Minister Wolfgang Schaeuble's office building, a day before he is due to host his new U.S. counterpart Steven Mnuchin for talks.

Berlin police spokesman Thomas Neuendorf said the package arrived Wednesday morning at 09:30a.m. He didn't give any details about the package or who might have sent it, citing an ongoing investigation.

Mailroom employees at the ministry quickly identified the package as suspicious and called in explosives experts, who destroyed it with a controlled explosion.

"The package contained an explosive mix," Berlin police said in a statement, adding that the substance is often used in the production of fireworks.

"It was designed to cause severe injuries when the package is opened," said police.