American inspectors were expected in Yemen Monday, where investigators said the plot originated, to examine security practices.
The young Yemeni woman arrested on suspicion of mailing the powerful bombs was released on bail Sunday, and a Yemeni official said authorities no longer believe she shipped the bombs.
Yemeni authorities arrested a woman Saturday and searched for other suspects linked to al-Qaida’s Persian Gulf faction in the plot to mail bombs powerful enough to down a cargo plane.
In light of Friday’s bomb plot, Kelly revealed the difficulty of the screening cargo entering the U.S. “Some of it is screened, but most of it is not screened,” Kelly said.
Authorities on three continents thwarted multiple terrorist attacks aimed at the United States from Yemen on Friday.