A bomb detonated Tuesday outside JP Morgan Chase & Co.’s offices in Athens, Reuters reported, citing a police source.

No injuries were reported.

It was a time-bomb at JP Morgan’s offices in central Athens,” a police official told Reuters. “The explosion damaged the outside door and smashed some windows.”

A local newspaper reportedly received a warning call prior to the explosion, according to Reuters.

Greece’s economic problems have roiled markets across the world in recent weeks, as concerns about its fiscal crisis casts doubt on the strength of the euro.