Baghdad, Iraq ? Sectarian violence has forced about 100,000 families across Iraq to flee their homes, a top Iraqi official said. At least 17 people, including an American soldier, were killed Saturday in fighting.

Adil Abdul-Mahdi, one of the country’s two vice presidents, estimated on Friday that 100,000 Iraqi families – 90 percent of them his fellow Shiites – had fled their homes to escape attacks by rival religious sects.

Abdul-Mahdi’s estimate was higher than any offered so far by Iraqi officials.

Dr. Salah Abdul-Razzaq, spokesman of a government body that runs Shiite religious institutions, put the number of displaced Shiite families at 13,750 nationwide, or about 90,000 people.

That includes 25,000 Shiites who have fled since the bombing of a Shiite mosque in Samarra on Feb. 22 triggered a wave of attacks on Sunni mosques and clerics.

The hardline Sunni clerical Association of Muslim Scholars said about 980 Sunni families, or about 5,000 people, have left five mixed areas of Baghdad in recent weeks and moved in with relatives in Sunni-dominated communities outside the capital.

However, the U.S. military insists that even the lower estimates appear exaggerated.

U.S. command spokesman Maj. Gen. Rick Lynch said this week that American troops investigate all reports of displaced people and have found no evidence of “widespread movement” away from religiously mixed areas.

Lynch said sectarian attacks in the Baghdad area had fallen by 60 percent last week and were approaching the levels before the Feb. 22 bombing of a Shiite shrine in Samarra, which triggered a wave of reprisal attacks against Sunnis.

Accurate counts are difficult because many people simply move in with relatives. Despite U.S. claims, it is clear that substantial numbers of people have relocated to areas where their communities form the majority.

About 400 Shiite families are in a camp near Khanaqin, a largely Kurdish town near the Iranian border. Most fled Baghdad with only what they could carry.

The Human Relief Organization, an Iraqi NGO, has provided the refugees with tents from the regional government and is talking with officials to get more help.

“We get some every day,” said Omar Mansour, an official with the relief group. “I’m afraid the numbers will increase greatly when the school year ends and people feel freer to flee. All these families have letters with death threats. So they came here fearing for their lives, only to live in these harsh conditions.”