Yemeni authorities are checking several more packages in the hunt for terrorists who tried to mail bombs to synagogues in the United States.
Authorities on three continents thwarted the attacks on Friday when they seized explosives on cargo planes at East Midlands airport in Britain and at Dubai airport in the United Arab Emirates.
Several US officials said they were increasingly confident that al Qaida's Yemen branch was responsible.
A Yemeni security official said on Saturday that investigators were examining 24 other suspect packages in the capital San'a.
The official said authorities were also questioning cargo workers at the airport as well as employees of the local shipping companies contracted to work with FedEx and UPS.