Immigration and Customs Enforcement agents appear to have stepped up their detention of unauthorized immigrants, taking more than 500 people into custody on Thursday, almost twice the average number of daily arrests late last year.

The numbers could indicate that the Trump administration’s show of force has so far outpaced the government’s ability to quickly deport more migrants.

The U.S. Congress on Wednesday delivered Republican President Donald Trump legislation requiring the detention of immigrants living in the U.S. illegally who are accused of theft, with a significant number of Democrats voting in favor.