Immigrant rights advocates across the United States say they've seen few signs of the ICE raids that Trump administration officials had warned would begin Sunday.

Major ICE raids didn't materialize over the weekend. But officials say the operation is still on

lmmigrant rights advocates across the United States say they've seen few signs of the ICE raids that Trump administration officials had warned would begin Sunday.

Does that mean officials changed their plans? Or is the operation still unfolding?

A senior immigration official who has seen the operation plans told CNN the list of target cities and individuals remains the same. The official had not received any details about total arrests so far. Officials previously have said ICE agents in 10 cities would be seeking 2,000 undocumented immigrants who'd been ordered removed from the United States.

A senior administration official told CNN that parts of the ICE deportation operation began on Saturday and would be expanded into other cities over the coming days.

"I wouldn't expect a big splash that matches the hysteria we've heard over the last several days," that official said.

2,000 undocumented immigrants in 10 cities

There also haven't been any confirmed reports of migrants being apprehended in Baltimore, Chicago or New York, immigrant advocacy groups in those cities told CNN.

Acting US Citizenship and Immigration Services chief says he does not know details of ICE raids

"For the most part, it's quiet," said Cara Yi, a spokeswoman for the Illinois Coalition for Immigrant and Refugee Rights. "We've been dispatching rapid-response teams out to meet with people who have reported ICE activity over our hotline. None have been confirmed as of yet."

Such ICE operations are not unprecedented. But it's uncommon for officials to talk about them so extensively before they occur. Some advocates questioned whether the President and his administration had released details about raids simply as a scare tactic. Others cautioned that it's too soon to say.

"It's very quiet. Let's hope it stays that way," said Jose Mario Cabrera of the Coalition for Humane Immigrant Rights of Los Angeles, speaking to CNN Sunday afternoon.

2,000 undocumented immigrants in 10 cities

There also haven't been any confirmed reports of migrants being apprehended in Baltimore, Chicago or New York, immigrant advocacy groups in those cities told CNN.

href="https://www.cnn.com/2019/07/15/politics/ken-cuccinelli-ice-raids-cnntv/index.html" target="_blank">Acting US Citizenship and Immigration Services chief says he does not know details of ICE raids

"For the most part, it's quiet," said Cara Yi, a spokeswoman for the Illinois Coalition for Immigrant and Refugee Rights. "We've been dispatching rapid-response teams out to meet with people who have reported ICE activity over our hotline. None have been confirmed as of yet."