LONDON — Car bombs at an Egyptian luxury hotel. Explosions in London subways. Suicide blasts in Baghdad.

With the frequency of terror attacks apparently mounting, experts searching for common threads behind the attacks suggest that the war on terror is being waged against an ever-increasing well of recruits, bound together by motives and cause — rather than a single al-Qaida mastermind.

With havens in Afghanistan under pressure and their finances under scrutiny, militants may take philosophical guidance from the likes of Osama bin Laden but are largely relying on their own resources in carrying out operations, experts interviewed by The Associated Press said Saturday.

"They all want to be part of this phenomenon," said Loretta Napoleoni, author of "Terror Incorporated: Tracing the Dollars Behind the Terror Networks," as she explained the terror wave. "It's not like someone is telling (the militants), 'You bomb on the first of July.' "

Anger over the U.S.-led war in Iraq and the Israeli-Palestinian conflict also seems to be providing some inspiration, despite early arguments from Bush administration officials that fighting insurgents in Iraq would help prevent them from launching attacks on Western targets. The war has instead turned into a recruiting tool, experts said.

The constant images on Arab language networks of dead and dying civilians — coupled with U.S. soldiers conducting operations — has only heightened sensitivities.

"Iraq has been an absolute gift to al-Qaida," said Paul Rogers, a professor of peace studies at Bradford University in northern England. "(Al-Qaida) seems to have no difficulty in getting more and more recruits."

The attack Saturday in Egypt came only two days after four bombs partially detonated on three subway trains and a bus, causing no deaths but spreading panic two weeks after four suicide bombers hit similar targets, killing more than 80 people.

Magnus Ranstorp, a terror expert at St. Andrews University in Scotland, said few definitive links between the attacks in London and Egypt were likely.

However, the attackers may have taken note of the London attacks and opted to accelerate their plans — hoping to make people even more afraid and the terror more widespread.

"It's more about the timing — to overwhelm the West," Ranstorp said, adding the idea may have been to "overstretch the enemy."

He also said al-Qaida itself has been long been divided into two camps — one that favors targets on secular regimes in the Middle East and another favoring targets among the "crusaders" of the West.