Multinational computer technology company Dell disclosed Wednesday that its online electronics marketplace experienced a “cybersecurity incident” earlier this month when an unknown group of hackers infiltrated its internal network.

On November 9, Dell detected and disrupted unauthorized activity on its network attempting to steal customer information, including their names, email addresses and hashed passwords.

According to the company, the initial investigation found no conclusive evidence that the hackers succeeded to extract any information, but as a countermeasure Dell has reset passwords for all accounts on Dell.com website whether the data had been stolen or not.