Four Japanese lawmakers have demanded the removal of a monument in the U.S. dedicated to the thousands of Asian women used as sex slaves by the Japanese Imperial Army during World War II.

They met the mayor of Palisades Park in New Jersey on Monday and insisted the monument plaque contains "unconfirmed" information such as the number of so-called comfort women. They claimed the Japanese government played no part in the rounding-up of women during the war.

The city, however, declined the request, saying the information on the plaque is based on historic fact and concrete data. The city erected the memorial in front of a public library in 2010.