The investigators carefully removed the homemade devices -- consisting of old liquor bottles filled with gasoline and having a wick -- and fingerprinted them. Police said the site where the devices were found was an area near 11th and Howard that had been traversed several times by a rather violent group demonstrators during Thursday's protests.
The backpack was found stashed under a bush.
"We will sustain this for many days. This is really just the start," said Jamie Hurlbut, a San Francisco office worker who was blocking downtown traffic as the sun came up Friday after spending eight hours in custody Thursday.
"I literally went to sleep and came back out to hit the streets again," he said.
From a morning die-in outside the federal building in Sacramento that resulted in 30 arrests to an attempt in Capitola to block entrance to a military recruiting center that ended in about a dozen arrests, actions ranging from tearful candlelight vigils to chaotic occupations of streets continued in earnest on Friday.
In Rohnert Park, Sonoma State University staff, faculty and students held a first day of spring rally while in Irvine, high school students were organizing a candelight vigil.
At the same time, pro-military activists also turned out to spread their support for the troops from Bakersfield to Berkeley.
"The people who scream the loudest are a fringe minority," said Rob McFadden, a senior politics student at UC Berkeley who passed out yellow ribbons in support of U.S. soliders. "But the fact is they're not the majority and most people support this action."
In West Los Angeles, five people waved American flags in front of the French consulate to protest that country's opposition to the war. They held signs saying "What is France hiding?" and shouted at passing cars: "Boycott France" and "Support our troops."
Larger anti-war demonstrations and vigils were scheduled for Saturday in San Francisco and Los Angeles, while in Long Beach the Surfrider Foundation was coordinating the formation of a giant peace sign consisting of 400 surfboards. In Palo Alto, a multifaith prayers of lament meeting was planned by the First Presbyterian Church.
On Friday, San Francisco continued to be the focal point for anti-war activism.
Before the morning fog had even burned off, police in San Francisco had already arrested more than 80 demonstrators, following a chaotic Thursday when police conceded they completely lost control of the crowds despite arresting about 1,400 people -- including 18 on felony charges.
By Friday morning, police said almost everyone had been released from custody but that they had learned their lesson, and would be bolstered by 450 California Highway Patrol officers determined to keep bridges and major arteries open.
"They think they can do this indefinitely. Not anymore," said police spokesman Dwayne Tully, who said the department had already spent $450,000 containing the protests.
Demonstrators said the change was palpable as police kept the crowd contained and moved in quickly to make arrests.
"Today feels more tense," said Deborah Cooper who brought her son, Casey, 11, with her. "I'm sure the cops are tired and they've gotten a lot of grief."
In downtown Los Angeles on Friday, 27 people were arrested for blocking the street in front of the federal building.
As demonstrators cheered, police in faceshields took away protesters one by one after they had linked arms and sat down in the street.
One of those arrested was Vanessa Acosta, 45, of Highland Park. She knelt in the street and prayed the rosary. She held a sign saying "Peace is the first casualty in war."
She held her hands together in prayer as she was led away.
"I want to give a little bit of myself ... the people in Iraq don't know who I am but at least I know that I'm with them," she said.
And in Sacramento, U.S. marshals arrested about 30 protesters who were blocking the entrances to the federal building.
"I believe we have an illegal government that stole the election, is robbing the treasury and is waging a war against a country that can't resist," said Murray Cohen, 65, before police took him away.
Copyright 2003 by KTVU.com. The Associated Press contributed to this report. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.