Do police arrest immigrants

Answer 1

Police may arrest anyone who has committed a crime, whether they are citizens or immigrants.

Immigrants may have additional restrictions or requirements beyond those of normal citizens, depending on the country. In some countries, the responsibilities for enforcing different titles of the law are split among different law enforcement agencies, while other countries have a single police force. In countries where the enforcement responsibility is separated, a law enforcement agency may contact the proper enforcing agency if it becomes apparent that a crime has been committed, which a different agency enforces.

For example, in the United States, aliens present in the country without the permission of the country (e.g. illegal aliens, invaders, spies) might be detained by the local police, who would then notify the enforcing agency (e.g. illegal aliens -> ICE, invaders -> army, spies -> FBI).