How much ETH was stolen in the DAO hack?

Could you elaborate on the extent of the financial impact caused by the DAO hack in terms of the amount of Ethereum (ETH) stolen? This particular hack has been widely discussed in the cryptocurrency community, and I'm interested in gaining a deeper understanding of the monetary implications. It's crucial to assess the severity of such attacks to ensure the security and stability of the blockchain ecosystem. Therefore, a precise figure of the ETH stolen during the DAO hack would be highly valuable.