nachogfa on "[Plugin: Wordfence Security] Blocking admin access to IP from from Amazon Services"

Hello, Got this alert a dozen times, every day:

This email was sent from your website "xyz" by the Wordfence plugin at Tuesday 14th of October 2014 at 08:09:47 PM
The Wordfence administrative URL for this site is: http://xyz.es/wp-admin/admin.php?page=Wordfence

Wordfence has blocked IP address 107.22.61.99.
The reason is: "Exceeded the maximum global requests per minute for crawlers or humans.".
User IP: 107.22.61.99
User hostname: ec2-107-22-61-99.compute-1.amazonaws.com

My limit is set 15 requests per minute, either for crawlers or humans.

I was wondering if this is a threat or just the Wordfence plugin trying to access and check for security issues.

Thanks very much for your feedback.

https://wordpress.org/plugins/wordfence/