Three Vietnamese illegal migrants in Kaohsiung City, Taiwan, were arrested by police officers following up a noise complaint lodged against them by their neighbors.

Upon receiving citizens’ complaints about a group of foreigners who allegedly often got drunk and disturbed the quiet neighborhood in Luzhu District, officers from the Kaohsiung City Government Police Bureau visited the residential unit to deliver a verbal warning. There, they found a house occupied by suspected illegal immigrants, the Real Daily reported.

The officers decided not to take immediate action, and arranged surveillance to gather evidence.

After several days of investigation, police conducted a special raid at the unit. There, they arrested three Vietnamese men, all later found to be illegal migrant workers who had run away from their former employers.

All three Vietnamese suspects were referred to the National Immigration Agency, which will arrange for their repatriation.