HONG KONG — North Korea has arrested a Christian missionary from Australia, his family said on Wednesday, taking him into captivity even as it continues to face pressure to release an American missionary it has held for more than a year.

The Australian, John Short, 75, was arrested in the capital, Pyongyang, on Sunday, according to his wife, Karen. She said the trip was her husband’s second to North Korea. He had religious materials that had been translated into Korean, according to a statement by his family.

Mr. Short’s detention comes more than a year after North Korea arrested Kenneth Bae, an American missionary, after he entered the country from China. Mr. Bae was sentenced to 15 years of hard labor for committing “hostile acts” against the North, and Pyongyang has repeatedly resisted strong American pressure to release him.