She added that Oakland, as a sanctuary city, had not broken any laws.
Of those, 180 "were either convicted criminals, had been issued a final order of removal and failed to depart the United States, or had been previously removed" from the US and returned illegally, ICE said.
The Justice Department is reviewing Oakland Mayor Libby Schaaf's "outrageous" warning to the community ahead of a large-scale operation by federal immigration authorities, the White House said Thursday.
U.S. Immigration and Customs Enforcement (ICE) agents arrested more than 200 suspected undocumented immigrants in raids over four days in California, the agency announced Thursday.
The arrests were part of a four-day targeted operation that ran from the Bakersfield area to the OR border. ICE confirmed that 150 individuals have been arrested for violations of immigration law in the region since Sunday.
Legal experts said it was unlikely that Schaaf could be charged with obstruction of justice, noting that her weekend news release was vague and that proving a corrupt intent would be hard. "Because these jurisdictions prevent ICE from arresting criminal aliens in the secure confines of a jail, they also force ICE officers to make more arrests out in the community, which poses increased risks for law enforcement and the public".More news: Raiders awarded four compensatory draft picks
Homan disputed the mayor's claim that the warnings made her community safer, saying 800 people that were targeted in the raids remain at large.
"Sanctuary jurisdictions like San Francisco and Oakland shield unsafe criminal aliens from federal law enforcement at the expense of public safety", Homan said in a statement. ICE did not provide a county by county breakdown of the arrests.
"ICE has no choice but to continue to conduct at-large arrests in local neighborhoods and at worksites, which will inevitably result in additional collateral arrests, instead of focusing on arrests at jails and prisons where transfers are safer for ICE officers and the community", the agency said.
"The federal government has declared a war on California because of our state's sanctuary law and other policies that directly contradict those of the Trump Administration, from offshore drilling to criminalizing adult cannabis use", Arreguín said in an email. Fox News notes that ICE officials are asking the Department of Justice to look into whether she broke any laws by doing so.
Oakland, like many California cities, has declared itself a sanctuary for those here illegally, and officials there have vowed to fight President Trump's immigration crackdown.
Schaaf has defended her statement, saying she felt it was her duty to warn residents of the ICE action.