CHICAGO — A teenage blogger from Singapore whose supporters say is seeking asylum is in custody after being detained last week at Chicago’s O’Hare International Airport, U.S. immigration officials said Saturday.

Amos Yee, 18, was detained Dec. 16 and remains in custody “pending federal immigration court proceedings,” U.S. Immigration and Customs Enforcement spokeswoman Gail Montenegro said in a written statement.

Separately, Marilu Cabrera with U.S. Citizenship and Immigration Services, which handles some asylum requests, said the agency “cannot confirm or deny” details of any asylum case.

The Human Rights Watch deputy director for Asia, Phil Robertson, called on the U.S. to recognize Yee’s asylum claim, saying he has been consistently harassed by the Singapore government for publicly expressing his views on politics and religion and severely criticizing the city-state’s leaders, including late Prime Minister Lee Kuan Yew.

Yee was imprisoned for six weeks in September on charges of hurting religious feelings of Christians and Muslims after repeatedly breaching bail conditions following a four-week prison sentence he served in July last year on the same charges.

He was also due to be called up for mandatory military service.

His U.S. lawyer, Sandra Grossman, told the South China Morning Post on Saturday that Yee was likely detained because he entered the country on a tourist visa despite an intention to apply for asylum.

She said Yee would have to undergo a “credible fear interview” by an asylum official who would assess if he faces a credible fear of persecution or torture back home. She said the process usually takes a few days, but the holiday season could delay it. He would then appear before an immigration judge, but that could take years because of backlogs in the immigration system.

Yee, who won a local filmmaking prize at age 13, ruffled feathers in Singapore with a video blog laced with expletives as the city-state was mourning Lee’s death last March.

Such open criticism and lampooning of leaders is rarely seen in Singapore, where laws are strictly enforced. The government of the multiethnic state says Yee crossed the red line on religion when he mocked Christians and Muslims and the law had to be enforced on him to protect racial and religious harmony.