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British Prime Minister David Cameron said he believes the explosive device found in central England was intended to detonate on the plane, while British Home Secretary Theresa May said the bomb was powerful enough to take down the aircraft. A U.S. official said the second device found in Dubai was thought to be similar in strength.
A U.S. official and a British security consultant said Sunday that the bomb that turned up in England nearly slipped past investigators even after they were tipped off. The near-miss shows it was sophisticated enough to escape notice.
After a six-hour sweep of cargo at the East Midlands airport in central England, Leicestershire police came up empty and removed the security perimeter they had set up, British aviation safety consultant Chris Yates said.
But when officials in Dubai said they had discovered a bomb disguised as a computer printer cartridge, authorities urged the British to look again, a U.S. official said, speaking on condition of anonymity because he was not authorized to discuss the matter.
"As a direct consequence, they put the cordon back up again and looked again and found the explosives," said Yates, relying on a report given to him by an eyewitness to the searches.
Brennan, Obama's counterterrorism adviser, called it "a very sophisticated device, in terms of how it was constructed, how it was concealed" and said it was a viable device.
"They were self-contained. They were able to be detonated at a time of the terrorists' choosing," Brennan said, adding that officials are trying to determine whether the planes or the synagogues were the intended targets.
Al-Qaida's offshoot in Yemen is suspected of mailing the bombs. The group was behind a failed bombing on a Detroit-bound airliner last Christmas that bore some of the same hallmarks as this plot.
In Yemen on Sunday, police were searching for additional suspects after arresting a female computer engineering student suspected of mailing the packages and also detaining her mother. Both arrests were on Saturday.
Yemeni President Ali Abdullah Saleh told reporters that the United States and United Arab Emirates had provided intelligence that helped identify the woman suspected of mailing the packages.
The 22-year-old Hanan al-Samawi is a student at the University of San'a, said Yemeni rights activist Abdel-Rahman Barman. Her 45-year-old mother was arrested with her, said Barman, of The National Organization for Defending Rights and Freedoms.
According to her university colleagues, al-Samawi is not known to be involved in any political activity or to have ties to any Islamic groups, Barman said. He said she had not been allowed access to a lawyer.
Yemeni officials pointed to additional suspects believed to have used forged documents and ID cards. One member of Yemen's anti-terrorism unit said the other suspects had been tied to al-Qaida.
Yemeni and U.S. officials spoke on condition of anonymity to discuss the ongoing investigation unfolding on three continents.