In a Tuesday tweet, GiveSendGo said it had been “attacked by malicious actors,” and that donor names and emails had been accessed but no money or credit card information taken. It also said it has a team “aggressively focused” on identifying those responsible.

“We are in a battle,” the company tweeted. “We didn’t expect it to be easy. This has not caused us to be afraid. Instead, it’s made it even more evident that we can not back down.”

GiveSendGo went offline Monday after the breach. The website had briefly carried an image from the Disney film “Frozen,” along with a ticker showing the names, donation amounts and email addresses of people who helped support the cause. The words “GiveSendGo is now frozen” appeared on the screen along with a link describing raw donation data.

A video captured by Canadian Broadcasting Corp. News reporter Travis Dhanraj shows scrolling text addressed to “GiveSendGo Grifters and Hatriots.”