"Alex was here" and "Murderer" were scrawled on the building on the Upper East Side in Manhattan, Newsday reported. Alexandros Grigoropoulos, 15, was shot and killed last week by police in Athens, triggering demonstrations and riots in the capital and around the country.
Police Commissioner Ray Kelly said that the vandalism is being investigated as a bias crime.
Investigators were checking for fingerprints around the broken window and trying to determine if security cameras caught anything, Kelly said.
Celebrity Breakups and divorces of 2014 [PHOTOS]