Anti-war rallies turned ugly in many parts of the country, with demonstrators hurling rocks, screaming obscenities and clashing with police, and a third day of riotous protests in San Francisco.

More than 1,400 people were arrested around the country Thursday, most for blocking federal buildings and more than 100 in confrontations between supporters and opponents of the war in an Ohio college town.A poll taken Wednesday night for ABC News and The Washington Post after the U.S. attack on Iraq found three out of four Americans supported President Bush's resort to force.

In San Francisco, police made nearly 1,000 arrests when some of the day's 7,000 anti-war protesters blocked a street near the Pacific Stock Exchange, said Ernest Chapman, a police officer.

Police broke a human chain around the federal building by swinging batons at protesters' hands as chants of "No war, no way, don't go to work today" echoed in the plaza.

San Francisco Mayor Art Agnos urged calm. "Our conscience has spoken," he said. "Our civility now must be demonstrated in equal measure."

In Newark, N.J., a 30-year-old Palestinian, Ayman Silwany, took his oath of U.S. citizenship Thursday, then strolled into a raucous confrontation over war in his native Middle East at the federal courthouse.

Silwany was sandwiched between protesters chanting "No blood for oil!" and construction workers who countered with obscenities. The Jerusalem native said he admired the vigorous debate in his adopted country but feared Americans take a short-sighted view of politics in his homeland.

"Have they thought about retaliation and terrorism in the future?" Silwany asked.

He spoke before Iraqi missiles bombed Israel, injuring at least 10 people. The attack brought swift condemnation from Jews and Jewish leaders.

"I'm terribly disturbed, frightened and a little angry that the world didn't listen," said Shoshana Cardin, chairman of the Conference of Presidents of Major American Jewish Organizations in New York. "This is what Israel was warning the world about."

Temple Emanu-el in San Francisco opened its doors to worshipers Thursday night once word of the attack spread.

"There's a feeling of anguish and shock and trauma right now," said Rabbi Robert Kirshner. "It wasn't unexpected, but it still comes as a shock."

In Missoula, Mont., a dozen war protesters delayed the start of a nationally televised basketball game between Idaho and Montana for five minutes Thursday night by lying on the court. The crowd responded with chants of "USA! USA!" and some threw potatoes, a tradition during visits by Idaho sports teams. Nine people were cited for disorderly conduct.

Earlier Thursday, in Sacramento, Calif., 100 war protesters who staged a peace sleep-in on the steps of the state Capitol was met by 300 demonstrators carrying signs such as "Support the U.S. - We Do" in favor of Operation Desert Storm. Police made about 100 arrests.