Sporting apparel manufacturer Adidas apologized Tuesday after it sent customers an email congratulating them for "surviving" the Boston Marathon.
The email's subject line read "Congrats, you survived the Boston Marthon," the Boston Post reported, which some recipients regarded as insensitive following the 2013 attack on the race.
Three people were killed and more than 260 others were injured when two bombs exploded near the finishing line four years ago.
"We are incredibly sorry," the company later wrote on Twitter.
"Clearly, there was no thought given to the insensitive subject line we sent Tuesday."
