HONOLULU -- The state is closing Iolani Palace Wednesday as a security precaution.

The palace has been a recent target of radical sovereignty groups.

Last year, one group seized the palace, ousting its employees. A second group chained the palace gates shut.

State officials said they are concerned about an early morning vigil scheduled to take place at the state Capitol on Wednesday. The gathering is meant to draw attention to a controversial ceded lands case being heard at the U.S. Supreme Court at 5 a.m. Hawaii time.

Native Hawaiian groups will start assembling at 4 a.m.

Tune in to KITV 4 Island Television This Morning for reports from Washington and the state Capitol.