LOS ANGELES — Advocacy groups say that Immigration and Customs Enforcement officers are rounding up people in large numbers around the country as part of stepped-up enforcement under President Trump. They say a roundup in Southern California was especially heavy-handed and cite arrests in places such as Atlanta, Chicago, New York, Texas, and North Carolina that have rattled immigrants.

The government says it’s simply enforcing the laws and conducting routine enforcement targeting immigrants in the country illegally with criminal records. Authorities say it’s no different than what happened during the Obama years.

The truth lies somewhere in between. Here are some of the facts around what’s happening with immigration enforcement.

Trump vs. Obama

As a candidate, Donald Trump vowed to take a hard line on immigration. Five days after taking office, he signed a sweeping executive order that made clear that just about any immigrant living in the country illegally could be a priority for deportation, particularly those with outstanding deportation orders. The president’s order also said enforcement priorities would include convicted criminals, immigrants who had been arrested for any criminal offense, those who committed fraud, and anyone who may have committed a crime.

Under President Obama, the government focused on immigrants in the country illegally who posed a threat to national security or public safety and recent border crossers. But despite the narrower focus, more than 2 million people were deported during Obama’s time in office, including a record of more than 409,000 people in 2012. At one point, he was dubbed the ‘‘Deporter in Chief’’ by his critics.

Are the latest raids a direct result of Trump’s order?

Immigration officials say they aren’t.

David Marin, Immigration and Customs Enforcement’s field office director for enforcement and removal operations in Greater Los Angeles, said the agency carries out these operations two or three times a year in his region. He says the California operation was in the planning stages ‘‘before the administration came out with their current executive orders.’’

But immigrant rights groups say the actions are harsher than in the past.

Advocates began fielding calls Thursday from immigrants and their lawyers reporting raids at homes and businesses in the Los Angeles area. In one instance, agents showed up at the home of a 50-year-old house painter named Manuel Mosqueda in the Los Angeles suburbs, looking to arrest an immigrant who wasn’t there. In the process, they spoke with Mosqueda, arrested him, and put him on a bus to Mexico — though lawyers were able to halt his deportation and bring him back.

In all, Immigration and Customs Enforcement arrested about 160 people during a five-day sweep in Southern California aimed at immigrants with criminal histories and deportation orders, including a Salvadoran gang member and a Brazilian drug trafficker. Marin acknowledged that five of those arrested wouldn’t have met the Obama administration’s enforcement priorities.

The agency called it an ‘‘enforcement surge’’ that was no different than actions carried out in the past, and said a ‘‘rash of recent reports about purported ICE checkpoints and random sweeps are false, dangerous, and irresponsible.’’

The new normal?

Despite the claims that this is business as usual, an indication of the changed tactics came earlier in the week when Homeland Security Secretary John Kelly testified before Congress. He told lawmakers that mmigration agents expressed frustration that they were not fully allowed to enforce immigration laws under the Obama administration. He predicted Trump’s directives would end that frustration.

‘‘I think their morale has suffered because of the job they were hired to do, and then in their sense, they’re . . . kind of hobbled or, you know, hands tied behind their back, that kind of thing,’’ Kelly told the House Homeland Security Committee. ‘‘And now, they feel more positive about things. I bet if you watch the morale issue, you’ll . . . be surprised going forward.’’

In at least one case, it seems clear that Trump’s order changed someone’s fate. Guadalupe Garcia de Rayos, a mother of two in Phoenix, was arrested nearly a decade ago for using a false ID to get a job as a janitor at an amusement park. She pleaded guilty to a felony charge, but the government during the Obama years declined to deport her despite her being in the country illegally. On Wednesday, she showed up at the ICE building in Phoenix for a scheduled check-in with immigration officers and was swiftly deported to Mexico.