SEOUL, South Korea — A group of eight South Korean students were detained Tuesday for allegedly breaking into a United States air base while shouting anti-U.S. slogans, South Korean authorities said.

U.S. military personnel detained the four male and four female students after they allegedly entered Osan Air Base near the capital Seoul. They were later transferred to the custody of South Korean authorities, police said.

The students were being investigated under a law protecting military installations in South Korea, according to police, who said they all had invoked their right to remain silent during questioning.

Police said the students shouted slogans at the site including, “Let’s smash U.S. 7th Air Force.”

A U.S. military statement said the group attempted to unlawfully enter the base through the main gate and that “unauthorized attempts to access a U.S. military installation are taken extremely seriously.”

The incident will be addressed in accordance with applicable U.S. and South Korean laws and procedures, the military said.

The Korean Progressive University Student Union said in a statement on Facebook that those detained were members who were trying to protest what it called the U.S. military’s opposition to a South Korean semiconductor cluster project.

South Korean police declined to comment on the group’s statement, which was not addressed by the U.S. military.

Yonhap news agency reported the U.S. said it has important interests in a military airport set to be relocated over the semiconductor project.

There are about 28,500 U.S. troops stationed in South Korea to help deter potential aggression from North Korea, a legacy of the 1950-53 Korean War that ended with an armistice, not a peace treaty.

Surveys have steadfastly shown a majority of South Koreans support the U.S.-South Korean military alliance, but the U.S. presence and its role in South Korea’s turbulent modern history also have been long-running sources of anti-U.S. sentiment among many in South Korea.

South Korean police arrested four students in 2019 who broke into the U.S. ambassador’s residence in Seoul while protesting the Trump administration’s demands for the country to pay more to help cover the costs of U.S. troops there.