The University of Colorado at Boulder announced Thursday that it will ban guns from undergraduate dormitories. A ruling by the Colorado Supreme Court in March ordered the university to allow those with permits to carry a concealed weapon to bring it on campus. But the University of Colorado Board of Regents has said that, consistent with the decision, the campuses could still develop some rules. Boulder will let those with a concealed weapons permit bring guns into graduate housing, provided the weapons are kept in a safe when not being carried.