About 8:30 a.m., a group of about 30 demonstrators from various environment groups gathered at the Metcalfe Federal Building at 77 W. Jackson Blvd., which also houses the State Department, police said. Chicago police said 12 women and 10 men were arrested and cited with criminal trespass for blocking the entryway to the building. No one was hurt and the protest was peaceful, police said.