With suicide explosions in Morocco (search) providing a fresh reminder of terrorism's reach, President Bush said Saturday that the United States will not relent in its pursuit of Al Qaeda operatives and other terrorists.

"The enemies of freedom are not idle, and neither are we," Bush said in his weekly radio address. "Our government is taking unprecedented measures to defend the homeland. And from Pakistan to the Philippines, to the Horn of Africa, we are hunting down Al Qaeda killers."

Bush was spending the weekend at the Camp David (search) presidential retreat in Maryland.

Even though the FBI knew of no Americans killed in the five nearly simultaneous in Casablanca, the Bush administration was offering U.S. assistance to Morocco to find those responsible for the attacks that killed dozens and wounded at least 100, a White House official said.

Last Monday, a series of suicide bombings in the Saudi capital of Riyadh (search) killed 34 people -- including eight Americans -- at three foreigners' housing compounds. Linking those attacks to Al Qaeda and citing new threats in Africa and Asia, U.S. counterterrorism officials warned of a coordinated effort by Usama bin Laden's (search) terror network to hit targets around the world.

"The terrorist attacks this week in Saudi Arabia, which killed innocent civilians from more than half a dozen countries, including our own, provide a stark reminder that the war on terror continues," said Bush, who recorded his address Friday before the explosions in Morocco.

The State Department (search), meanwhile, warned Americans to watch for suspicious activities that could point to planning for a suicide truck bombing. An alert issued through the agency's Overseas Security Advisory Council (search) said the Homeland Security Department has no information about a specific threat of a truck bombing.

But it advised the public to watch for certain indicators, including the theft of explosives or materials used to make them; rental of storage spaces for chemicals; chemical fires, toxic odors, rusted metal fixtures or suspicious stains in apartments and hotel rooms; test explosions in secluded areas; the treatment of chemical burns or missing fingers; and the modification of trucks to handle heavier loads.

Noting that Saturday was Armed Forces Day, Bush focused his radio address on praising the vast capabilities of the U.S. military and paying tribute to American troops killed and wounded in the Iraq war. The commemorative day was created in 1949 to replace separate observances by the Army, Navy, Air Force and Marine Corps to honor service members.

Eight military members who fought and were wounded in Iraq joined the president in the Oval Office for the taping.

"Americans are proud of every man and woman who has faced the risks of war in the cause of freedom," he said. "Many still face dangerous duty in Iraq and Afghanistan as they provide order and stability in liberated countries. Many are fighting on other fronts in the war against terror, and some brave Americans have given their lives to protect our country and to keep the peace."

There has been no evidence of a connection between Saddam Hussein's government and the attacks of Sept. 11, 2001. The banned weapons that the administration said Saddam possessed and which were cited as justification for the U.S.-led war also have not been found in the almost six weeks since Baghdad fell.

Still, Bush grouped the U.S. military success in Iraq with the campaign in Afghanistan, calling both battles that provided key victories in the global fight against terrorism.

"With the liberation of Iraq and Afghanistan, we have removed allies of Al Qaeda, cut off sources of terrorist funding, and made certain that no terrorist network will gain weapons of mass destruction from Saddam Hussein's regime," he said.

He also said that nearly half of Al Qaeda's senior operatives have been captured or killed.