The operation to flush out illegal immigrants intensified with food stalls and residential areas in Selangor were raided by the authorities last night.
13 immigrants found without valid travel documents, were detained.
Restaurants and food stalls in USJ Sentral and residential areas in Desa Millenium and Mentari Court were inspected during the integrated operation.
Over 30 foreigners were checked.
Some illegals tried to escape on seeing the enforcement team but were apprehended.
Those detained from Nigeria, India, Vietnam and Indonesia, did not possess valid travel documents or work permits while some were in possession of fake documents.
Selangor Immigration Assistant Director, Muhammad Amri Muhammad Sum said the operation would be be held until the end of the year to rid the country of illegal immigrants.
Those detained were sent to Semenyih and KLIA immigration depots for further action.