Those who live in Korea can attest to the amount of third country nationals from Islamic countries that work in difficult labor jobs in Korea. With the amount of Muslims workers in Korea combined with the number of US military installations in Korea, it really was only a matter of time before the radicals would try something and it is good to see that the South Korean authorities were ready:

Since 2002, the National Intelligence Service has investigated 107 suspects in connection with six cases involving Middle East terror organizations, the agency said in a report to a legislator made public yesterday.
The intelligence service, according to Representative Won Hye-young of the Uri Party, said South Korea has not escaped involvement with terror attempts by radical Islamist groups.
According to the report, the service learned in May 2005 that an Iranian organization linked to Hezbollah, named by the United States and a few other nations as a terrorist organization, had been involved in wire transfers of cash amounting to about 60 billion won ($63 million).
The transfers had been disguised as trade transactions; it was not clear from the report if the money had been raised in Korea or had been routed through this country in an attempt to disguise its origins. One Iranian was sentenced to a year in prison here for violations of Korea’s financial transfer laws.
In May 2004, the report added, the spy agency learned that people linked to Jemaah Islamiah, another Islamist group, were arriving in Korea to set up a base of operations here. Eight Moroccans were denied entry and turned over to Moroccan intelligence in October.
One Korean-American suspect was cited in the report; the agency said it and the U.S. Federal Bureau of Investigation in March 2003 jointly tracked down a 30-year-old man affiliated with a Pakistani terror group.
He was deported to the United States, where he received an 11.5-year sentence after being convicted of being a member of a terror organization and having received paramilitary training.

HT: TKL