Government officials have been quietly stepping up counterterror efforts out of a growing concern that al Qaeda or similar organizations might try to capitalize on the spate of extremely high-profile events in the coming months, sources tell ABC News.
Security experts point to next month's Olympics as evidence that high-profile events attract threats of terrorism, like the one issued this past weekend by a Chinese Muslim minority group that warned of its intent to attack the Games.
Anti-terror officials in the U.S. cite this summer and fall's lineup of two major political parties' conventions, November's general election and months of transition into a new presidential administration as cause for heightened awareness and action.
This is what the Department of Homeland Security is quietly declaring a Period of Heightened Alert, or POHA, a time frame when terrorists may have more incentive to attack.
According to drafts of government memos described to ABC News, the period would run roughly from this August through July 2009.
During this time, homeland security analysts will be asked to redouble efforts to study terrorism leads. And a number of agencies will be asked to review emergency response plans to a variety of attacks, from improvised explosive devices (IEDs) to biological weapons.
Officials also are being asked to make sure they are prepared for all contingencies during the transition from the Bush administration to that of the next president.