Block multiple IP's via CLI

I currently run a business that uses a Fortigate 100D on 5.6.5, we use this as the primary firewall but have various software firewalls behind the main device.

I get notifications daily where the server firewalls (csf) have blocked ip addresses. Rather than logging into the cli and manually searching for IP's then blocking them, is there a way from the cli to list the IP's and block them in one go.

This would be especially useful when the IP hasn't been recorded due to log file filling and wiping.

Appreciate your help in advance