WAR ON TERRORISM New developments

The latest developments in the war on terrorism:
MANHATTAN DUST
Scientists say the thick layer of irritating dust that blanketed lower Manhattan after the Sept. 11 terrorist attacks probably will not cause alarming increases in cancer, emphysema and other serious long-term health problems.
An analysis found that most of the potentially toxic dust particles collected in the week after the attacks were too large to lodge deep in people's lungs. Only 1 percent of the dust samples was composed of finer particles, researchers said.
In addition, the chemical composition of the dust appears less toxic than originally feared.
Many lower Manhattan residents and rescue workers at ground zero have reported continuing respiratory problems. The dust from the collapsed World Trade Center towers was a largely a combination of pulverized glass and concrete, among other materials, that can be extremely alkaline and irritating.
ROCKET IN AFGHANISTAN
Unidentified attackers fired a rocket toward a U.S. base in central Afghanistan, but no casualties or damage were reported, the military said Tuesday.
U.S. Special Forces were deployed after Monday night's attack in Deh Rawood district in Uruzgan province, but didn't find the attackers, the U.S. military said in a statement from Bagram Air Base, the headquarters of U.S. forces in Afghanistan.
It was unclear how close the rocket came to the base.
Crude rockets, often connected to timers, are fired at U.S. forces almost daily in Afghanistan, but the attacks rarely cause casualties.
One U.S. soldier, however, was wounded in a rocket attack Friday on a U.S. base in Asadabad, in the eastern province of Kunar.
WTC SITE PLANS
Former Mayor Rudolph Giuliani criticized the newly unveiled design plans for the World Trade Center site, saying the proposals failed to convey "the horrific nature of the attack that took place."
Giuliani has advocated setting aside a large portion of the site for a memorial to honor the Sept. 11 victims.
The Lower Manhattan Development Corp. last week released nine proposals for the 16-acre site. Four of the plans proposed creating skyscrapers even taller than the felled 110-story Twin Towers. Each proposal includes a memorial.
"These designs put the cart before the horse," Giuliani told reporters on Monday while signing copies of his autobiography, "Leadership." "The first thing any design there has to say to you is the significance of what happened, not the significance of the office or retail space."
WARNING TO EAST AFRICA
The State Department alerted Americans in East Africa on Tuesday that terrorists might strike and said Kenya's capital, Nairobi, was under threat of missile attack.
Similar attacks may occur in the East African nation Djibouti, the department said, citing unconfirmed information.
In Nairobi, there is an increased threat against Westerners. The department advised U.S. citizens there and those planning to travel to Kenya to be wary.