The 9/11 Remembrance Garden at Boston Public Garden was damaged overnight, with flags uprooted and trash cans overturned.
Photos showed a number of small American flags scattered across the pavement Thursday morning. Several trash cans were also overturned, with garbage scattered across the ground.
Boston police said they received a call for vandalism at the 9/11 Remembrance Garden and were investigating.
A person who police believe was responsible for the damage has been identified, a department representative said Thursday evening, but no further information was available.
The flags had been put up on Wednesday by volunteers with the Project 351 Team. They planted 2,997 flags in honor of all of those killed on 9/11.