Suppressing Event Details From Alert

Suppressing Event Details From Alert

I have been customizing the body of an alert for locked out users. The contents of the alert are:

Modified Time: %TIME_GENERATED%
User Name: %ACCOUNT_NAME%
SID: %ACCOUNT_SID%
Machine Name: %CALLER_MACHINE_NAME%
User Domain: %CALLER_USER_DOMAIN%
Domain Controller: %SOURCE%
Event Number: %EVENT_NUMBER%

Yet, for some reason, when the email is sent, it is appended with "Event Details", 34 additional lines of data that I do not want in my alert email.

How do I prevent this from happening?
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