The 70-day crackdown just ended a few weeks ago and the results are in.

Police have arrested 8,035 violators of the Immigration Law during a 70-day crackdown started April 1. They have detained 148 and booked 7,887 without physical detention, the National Police Agency said Monday.

Chinese nationals made up the largest portion of the foreigners arrested, totaling 2,744. The most common offence was illegal marriage to obtain Korean citizenship, which made up 45 percent of the total cases.

Other major illegal activities include document forgery for visa application, which accounted for 14.5 percent. Unqualified native English and Chinese-speakers made up 8.3 percent. Most of them entered Korea on tourism or student visas, which do not allow them to work here.

“Due to the English education fever here, a lot of foreigners, especially from English-speaking countries, are often found working illegally here without the proper visa,” a police official said.