LOS ANGELES (AP) - With the U.S. government moving closer to war with Iraq, thousands of demonstrators, some pushing strollers and walking dogs, took to the streets of downtown Los Angeles Saturday to voice their protest. Organizers put the turnout at 20,000. But police offered a much smaller estimate of 3,000. There were no reports of arrests or incidents, said Officer Grace Brady, a spokeswoman for the Los Angeles Police Department. Additional demonstrations, timed to coincide with the upcoming Martin Luther King Jr. holiday weekend, are scheduled to take place in San Francisco and Washington, D.C., next Saturday.