By Joe Sutton and Holly Yan
(CNN) — From the streets of California to the stores of New York City, protesters are making sure no one forgets the case of Eric Garner.
But some are choosing to do so more violently than others.
Demonstrators flooded a highway in Oakland, California, prompting a heated standoff in the freeway between protesters and California Highway Patrol late Sunday night.
Some threw explosives, bottles and rocks at officers, authorities said.
Officers responded by deploying gas and arresting eight protesters.
Gurpreet Heer, a student at the nearby University of California at Berkeley, said he saw people throwing glass and rocks at police.
“People were vandalizing police cars and jumping on the cars,” Heer said.
Police said five patrol cars had been damaged.
In the city of Berkeley, some protesters looted and vandalized businesses late Sunday night, police spokeswoman Jennifer Coats said.
One protester was struck in the head with hammer when he attempted to keep fellow protesters from damaging and looting a Radio Shack, Coats said. The man was hospitalized, but his injuries are not believed to be life-threatening.
Coats said some arrests were made, but could not confirm the number of arrests.
The acts of violence were apparent anomalies in a sea of protests nationwide decrying a grand jury’s decision not to indict the officer who killed Garner, an unarmed black man.
Garner’s last words — “I can’t breathe” — have become a rallying cry for protesters denouncing police brutality, particularly against unarmed black men.
The grand jury’s decision not to indict New York City police Officer Daniel Pantaleo in Garner’s death came a week after a Missouri grand jury decided not to indict former Officer Darren Wilson, who fatally shot unarmed black teenager Michael Brown in Ferguson.
Caroling their grievances
Some demonstrators are getting more creative in delivering their message.
In New York, protesters at Penn Station sang “justice carols,” such as these lyrics to the tune of “Little Drummer Boy”:
“Help, he told them,
pa rum pum pum pum,
I cannot breathe, you see,
pa rum pum pum pum,
Our city’s finest bring,
pa rum pum pum pum,
Death to this human being.”
Hundreds of protesters also gathered at Grand Central station and Macy’s in Herald Square — sites of multiple “die-ins” over the past few days — before barging through the nearby Toys R Us to lie on the floor en masse.
One young couple made the event a family affair, lying on the floor with their toddler between them.
Not everyone on their side
In Imperial, Missouri, demonstrators staged a different kind of protest Sunday.
They burned St. Louis Rams football jerseys after five players ran onto the field last weekend making the “hands up, don’t shoot” gesture, CNN affiliate KSDK reported.
That gesture became a symbolic part of anti-police demonstrations in the Michael Brown case.
“Why would you do something like that? It’s utterly ridiculous,” said Larry Magee. “I think the Rams ought to pack their bags, and I’ll give them a plane ticket back to L.A.”
Mother encourages protests
Garner’s mother said Sunday she’s proud of those who have been peacefully protesting the death of her son.
“Peace is the message,” Gwen Carr said at her church on Staten Island, according to CNN affiliate NY1.
“We don’t want any violence, but keep on moving on.”
CNN’s Stephanie Gallman and Ralph Ellis contributed to this report.
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