An immigration official apprehended a Vietnamese man accused of illegally entering South Korea, the Justice Ministry said Wednesday.

The 25-year-old was detained in the southeastern city of Daegu around 2:30 p.m., the ministry said.

The detention came five days after he forced his way through the gate of an unmanned automatic immigration checkpoint at Incheon International Airport, west of Seoul.

The suspect was supposed to leave for Tokyo at 10:10 a.m. on Jan. 29 after arriving at Seoul via Korean Air at around 5:05 a.m. from Hanoi.

Last month, a Chinese couple was caught by immigration authorities after illegally sneaking into South Korea at the airport. 

On Tuesday, President Park Geun-hye instructed Cabinet officials to strengthen security at the country's main gateway to ensure that safety breaches do not recur. (Yonhap)