No technology can detect every threat, but each contribution adds logistical complexity to the terrorist and increases the chances for detection.
Such gestures would lessen any Palestinian political backlash against a roundup of terrorists and would increase diplomatic pressure on Mr. Arafat to offer compromises of his own.
In 2015, governments rushed to stiffen counter-terrorist legislation and increase police powers, just as they had in 2002.
Respondents said that Mr. Bush's policies in Iraq were having the effect of creating terrorists and of increasing the chances of another terrorist attack at home.
A decline in travel after the Sept. 11 terrorist attacks and increased pressures from retailers turned their investment thesis on its head.
The commission began focusing on that approach after the Sept. 11 terrorist attacks, and increased its efforts after the Fukushima accident that stemmed from an earthquake and tsunami in March 2011.
Margie Feinberg, a spokeswoman for Schools Chancellor Harold O. Levy, attributed the poor attendance to the warnings from Washington of possible imminent terrorist attacks and increasing fear about biological attacks after the city's first case of inhalation anthrax was discovered this week.
"I am sure that now in the shadow of the recent terrorist attacks and increasing threats in Europe there will be more understanding among the ministers, even among those who come from countries where there has not been a terrorist attack," she told Reuters.
Last year she pressed her case to G7 leaders, and was today touting "progress" on international co-operation between governments and tech firms to "move further and faster in reducing the time it takes to remove terrorist content online and increase significantly their efforts to stop it being uploaded in the first place".
