KUWAIT CITY, Kuwait — A small number of U.S. troops were injured Sunday when an unidentified man drove a pickup into a crowd waiting to shop at the field exchange at Camp Udairi.

About six troops were hurt and are being treated, according to Air Force Lt. Col. Larry Cox, a military spokesman.

Cox said information still was being gathered, but that shots were fired after the crash about 12:50 p.m. local time. The driver was apprehended.

Cox did not know if the driver had been injured in the crash or the subsequent gunfire. Several of the injured Americans were treated at the scene.

Military officials said the man driving the small truck was not American or Kuwaiti, but a “third-country national.”

More than half of the people in Kuwait are foreign workers, many from the Philippines, India, Bangladesh and other Middle Eastern countries.

On Saturday, four U.S. soldiers were killed at a checkpoint in Central Iraq when an Iraqi soldier dressed in civilian clothes feigned his car was broken and then exploded a bomb.

At a news briefing in Doha, Qatar, Gen. Tommy Franks, the U.S. war commander, had no further details about the Sunday incident but noted it was significantly different than the car bombing.

“It was obvious that the modus of the second attack [at Camp Udairi] was not at all like the first [a suicide car bombing],” he said.

Camp Udairi is primarily a V Corps aviation base that is also used for maintenance and supply. It is the United States’ northernmost base in Kuwait, near the Iraqi border.

Kuwait, an oil-rich desert state slightly smaller than New Jersey, has hosted U.S. troops since the Gulf War ended in 1991 and is the key launching site for U.S. ground forces invading Iraq.

U.S. troops and civilians have been killed or wounded in Kuwait in several incidents since October.

Islamic extremists were blamed for the Jan. 21 shooting that killed a San Diego computer contractor and injured another American close to Camp Doha, where U.S. forces are based.

A Kuwaiti policeman faces trial on charges of shooting and seriously wounding two U.S. soldiers Nov. 21.

In October, Muslim fundamentalists killed one Marine and injured another on a Kuwaiti island. Other Marines killed the gunmen.

— The Associated Press contributed to this report.

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