Investigators have always wondered if more terrorists were involved in the bombings than just the brothers . Former Navy investigator : I ` ` ` they had somebody who was more of a skilled bomb expert .. assist them '' There was no doubt the brothers ever planted their bombs before using them , ` ` ` .
Investigators have always wondered if more people were involved in the bombings than just the brothers . Former Navy investigator : I think `` they had somebody who was more of a skilled bomb maker .. assist them '' There was no evidence the brothers ever tested their bombs before using them , CNN analyst says .