London ? Tens of thousands of people demonstrated Saturday in cities across the world and outside U.S. military bases, but their rallies for an immediate end to war in Iraq were far smaller than recent protests.

“Bush, murderer,” chanted protesters in Paris, while demonstrators in Finland roared: “George Bush, CIA, how many kids did you kill today?”

Organizers said they had little time to plan the protests, and there was little sign of people responding to calls to pour into the streets or responding spontaneously to the start of war. Despite large turnouts in some cities Saturday, the mostly peaceful marches were dwarfed by antiwar protests Feb. 15, which saw some of the largest demonstrations in history.

In the African nation of Sudan, antiriot police shot dead a 19-year-old university student during a protest in the capital, Khartoum, his cousin told The Associated Press. Police were not immediately available for comment. No further details were available.

Jaakko Kartano, a student at a march in Helsinki, Finland, said “People ask what’s the use of this, but our task is to instill faith in people and try and prevent anything like it (the war) happening again.”

There was a sense of frustration among marchers in London. The turnout — put at 200,000 by police — was much lower than last month’s mass rally, which drew at least 750,000 people.

Many protesters said they did not expect British Prime Minister Tony Blair or President Bush to listen to them.

“I don’t think there is a snowball’s chance in hell this march will stop the war, but it’s going to send out a message to next time, maybe,” said Ernie Vandermass, a student who marched in London.

Protests would grow as the war continued, organizers said, but some marchers said people were discouraged and support may be ebbing.

More than 200,000 marched down a main boulevard in Montreal. Tens of thousands protested in dozens of marches in European countries, including Britain, France, Germany, Finland, Italy, Sweden, Norway and Denmark.

A few radicals scuffled with police on the fringes of some demonstrations and there were scattered arrests.