In Mexico City, Mayor Marcelo Ebrard announced he would try to join lawsuits seeking to overturn the law, with a statement from his office calling the measure "a planned Apartheid against Mexicans."
Officials in El Salvador urged people to avoid traveling to Arizona, according to the Foreign Ministry. In Nicaragua, officials called on the Organization of American States and the United Nations "to take the necessary measures to safeguard the rights of the Hispanic population."
The National Coalition of Latino Clergy and Christian Leaders also sued Thursday, and sought an injunction preventing authorities from enforcing the law. The group argued that federal law pre-empts state regulation of national borders, and that Arizona's law violates due process rights by letting police detain suspected illegal immigrants before they're convicted.
In his lawsuit, Escobar, the Tucson police officer, argued he'll be sued whether he enforces the law or not, either for violating civil rights or for refusing to enforce it.Tucson police said Escobar acted on his own.
At least three Arizona cities — Phoenix, Flagstaff and Tucson — are considering legal action to block the law.
Politicians from around the country also weighed in. Colorado Gov. Bill Ritter said he would veto a new law like the one in Arizona, while Texas Republican Gov. Rick Perry said such a law would be wrong for his state because it has a tradition of rejecting harsh anti-immigrant policies.
Supporters of the new law also were vocal outside Arizona.
A group of conservative state lawmakers in Oklahoma said they plan to introduce a bill similar to Arizona's. In Texas, Rep. Debbie Riddle, a Republican, said she will introduce a measure similar to the Arizona law in the January legislative session. And Republicans running for governor in Colorado and Minnesota expressed support for the crackdown.
Associated Press writers Mark Carlson and Amanda Lee Myers contributed to this report.
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