Updated at 12:25 p.m. Eastern
One of two mail bombs sent from Yemen last week was disarmed just 17 minutes before it was set to go off, the French interior minister said Thursday, but American and British officials said they had no information that would confirm that.
White House press secretary Robert Gibbs said the question of when the bombs found in Britain and the United Arab Emirates were to go off was still under investigation and there was no information confirming such a close call.
U.S. investigators also said they were unable to confirm the French report.
A government official in Britain said the device found there was still undergoing forensic tests and it had not been determined how close it was to being detonated. A security source in the United Arab Emirates said Hortefeux's remark was not a description of the bomb found in that country.
The question of when the bombs were set to go off is central to the investigation because it could indicate whether terrorists hoped to blow up the planes over U.S. airspace or whether they simply wanted to take down the planes regardless of their location.
"One of the packages was defused only 17 minutes before the moment that it was set to explode," French Interior Minister Brice Hortefeux said. He made no other statement about the Yemen bomb plot during an interview on France's state-run France-2 television that focused on other security-related matters.
"If this was a reference to the device found in the Federal Express (Fedex) site in Dubai, then it is not correct," the source in the United Arab Emirates who is familiar with the investigation told the Associated Press. The security source was not authorized to discuss the case publicly and could not be named. The British government official also was not authorized to speak publicly of the case and could not be named.
A counterterrorism source confirms to CBS News
it was the bomb found on a plane at East Midlands airport, in England, that was defused just minutes before it was set to explode. The source also confirmed the 17 minute count left on the clock.Special Section: Terrorism in the U.S.
Hortefeux also said France had beefed up security on freight and passenger flights in the wake of the cargo bomb attempts, reports CBS News' Elaine Cobbe
. He called for stricter security measures on international travel, including more screening of passengers.
Hortefeux did not say where he got the information about the timing, although U.S. and European intelligence officials have been exchanging information on the plot. The French Interior Ministry would not elaborate on Hortefeux's comment. The minister was said to be in meetings throughout the day.
When investigators pulled the Chicago-bound packages off cargo planes in England and the United Arab Emirates Friday, they found the bombs wired to cell phones and hidden in the toner cartridges of computer printers. The communication cards had been removed and the phones could not receive calls, officials said, making it likely the terrorists intended the alarm or timer functions to detonate the bombs, U.S. officials have said.
The bomb found at East Midlands airport in central England went unnoticed for several hours.
Intelligence officials in the U.S. said Wednesday that each bomb was attached to a syringe containing lead azide, a chemical initiator that would have detonated PETN explosives packed into each printer cartridge. Both PETN and a syringe were used in the failed bombing last Christmas of a Detroit-bound airliner.
Investigators have centered on the Yemeni al Qaeda faction's top bomb maker, who had previously designed a bomb that failed to go off on a crowded U.S.-bound passenger jetliner last Christmas.
This time, authorities believe that master bomb maker Ibrahim al-Asiri packed four times as much explosives into the bombs hidden last week on flights from Yemen. The two bombs contained 300 and 400 grams of the industrial explosive PETN, according to a German security official, who briefed reporters Monday in Berlin on condition of anonymity in line with department guidelines.
By comparison, the bomb stuffed into a terrorist suspect's underwear on the Detroit-bound plane last Christmas contained about 80 grams.
One of the explosive devices found inside a shipped printer cartridge in Dubai had flown on two airlines before it was seized, first on a Qatar Airways Airbus A320 jet to Doha and then on an as-yet-undisclosed flight from Doha to Dubai. The number of passengers on the flights were unknown, but the first flight had a 144-seat capacity and the second would have moved on one of a variety of planes with seating capacities ranging from 144 to 335.
The packages were addressed to two Chicago-area synagogues. Because the addresses were out of date and the names on the packages included references to the Crusades - the 200-year wars waged by Christians largely against Muslims - officials do not believe the synagogues were the targets.More Mail Bomb CoverageTerrorists Used Dry Run to Track Airline CargoPackages from Yemen in Sept. Eyed as Dry RunMail Bomb Security Fixes Would Cost BillionsU.S. Boosts Mail, Cargo Scrutiny amid Bomb ProbeU.S. Official: Yemen Cargo Bomb Threat OngoingYemeni Mail Bomb Suspect Released on BailOfficials: Investigators Nearly Missed 1 BombMail Bomb Found in Dubai Was on Passenger Planes