charge of the investigation, settlement or defense of such "suit" against the "insured" seeking damages on account of "bodily injury", "property damage", "personal or advertising injury", or injury or damage to the environment arising directly or indirectly out of a "certified act of terrorism". However, we shall have the right and be given the opportunity to be associated in the defense and trial of any such "suit" relative to any "certified act of terrorism" which in our opinion may create liability on our part under the terms of this policy.

b. We shall have no obligation to defend the "insured" in such "suit" until the "insured's" losses, which exclude any costs of investigation, settlement or defense have exceeded the "certified act of terrorism retained limit". Once such losses have exceeded the "certified act of terrorism retained limit", we will assume charge of the settlement or defense of any such "suit". We may make such investigation as we require and effect settlement of any "suit" so defended.

c. We shall not be obligated to defend any "suit" after the applicable limits of this policy have been exhausted.

All other terms and conditions of this policy remain unchanged.