MUMBAI, March 2 — For the second day in a row, there were raucous protests across India today against President Bush"s visit, with the most militant here in India"s commercial capital.

As Mr. Bush was having lunch with Prime Minister Manmohan Singh in the capital, New Delhi, tens of thousands of demonstrators turned out at the Azad Maidan, a field in Mumbai made famous by Gandhi"s civil disobedience protests against British rule.

The protest, called by Muslim organizations and leftist political parties, was largely peaceful, but bristling with an anti-American rage that is not often on display in this country. The demonstrators shouted slogans against Mr. Bush. In one section of the field, a crowd gathered to burn an American flag. The crowd began beating the flaming flag. Then a young man lifted a boy named Shoaib over the fire and instructed him to urinate on it. He did, bemused by all the attention on him. He said he was in third grade.

Nearby, a few dozen men nearby stood under a banner declaring: "We are ready to become suicide bomber." It is a sentiment rarely expressed openly in India, which has had domestic terrorism over the years but whose citizens have not seemed to be attracted to the current global terrorist networks.

"Suppose Bush is here," said Sajid Khan, 25, a student. "I will suicide bomb to Bush. If we could get a visa, we would go there and fight."

Crowd estimates varied from 250,000 to 700,000, according to city police and a protest organizer — or between 10 and 25 percent of the Muslim population of Mumbai.

On the streets of New Delhi, protests were much milder today than on the day before. Fewer than 10,000 people showed up for a protest march and rally called by leftist political parties. "I am Bush. I ambush," read one placard. "Bush go back," the crowd chanted.

"We oppose Bush and our government," said an agricultural laborer named Bijender Singh, 28. "Why did they invite Bush?"

Prakash Karat, secretary of the Communist Party of India, told the crowd at the rally, half a mile from the Parliament building, "George Bush is the guest of the government of India but not of the people of India."

Mr. Karat"s party supports Mr. Singh"s Congress Party-led coalition government but has been the loudest voice of opposition on the nuclear deal between the United States and India. The Communists also staged a protest on the steps of the Parliament.

Jainarain Singh, a security guard active with the Communist Party, said he considers the alliance with the Bush White House to be detrimental to India"s growth — exactly the opposite of the message Prime Minister Singh tried to convey. "We should be independent," he said. "We should not decide our policies under U.S. pressure."

All roads and lanes leading from the march route to Hyderabad House, where Mr. Bush and Mr. Singh held a joint news conference, were heavily fortified by police.

From the eastern city of Calcutta, television news stations reported protests that drew an estimated 50,000 protesters who burned effigies of Mr. Bush.

Elsewhere in the capital, Mr. Bush"s appearance today seemed to draw far less interest than the test cricket match between India and England. At a Subway fast-food restaurant on Connaught Place, New Delhi"s commercial center, the television was tuned in to the cricket match.

Rajesh Kumar, 42, a marketing and sales executive for an Indian airline, said he was cynical about how India would benefit from the nuclear agreement. "It"s just a balloon of air, designed to pump up India"s ego," he said. ""People are still fighting for their bread and butter here — this won"t solve anything."

He added, "America wants to dominate the world."

The nuclear deal did not much energize a computer engineering student, Sidharth Jain, 19, either.

"The deal doesn"t matter to us much," he said. "I don"t think anyone really understands what it means." But he was hopeful that improved ties with the United States might make it easier for him to go to a university in America.

Anand Giridharadas reported from Mumbai for this article and Hari Kumar from New Delhi. Amelia Gentleman contributed reporting from New Delhi.