A cyber attack shut down Charles Schwab Corp’s website and mobile applications for nearly two hours on Tuesday but no client data or account information was compromised, a spokesman for the brokerage said.

The company’s website went down at roughly 3:45 p.m. EDT (1945 GMT) and the company said it saw a high volume of website traffic “which we believe was related to a denial-of-service attack.”

“Based on our analysis, we are very confident that the denial of service attack had no impact on client data or accounts,” Schwab spokesman Greg Gable said in a statement.