From NPR News in Washington, I'm Korva Coleman.Police in Newtown Connecticut are still investigating the crime scenes where 27 people died yesterday.NPR's Quil Lawrence reports the names of the victims have not yet been released.Police Lieutenant Paul Vance said the investigation could take daysas detectives examine the school and one other crime scene, where a single female adult victim was discovered.He said that all of the families of the adults and children killed in the attack had asked that their privacy be respected.They are going through as I know you understand a very difficult and trying time.The police confirmed that there was a single gunman,that all the weapons used in the crime have been recoveredand that the killer did force his way into the school.Vance announced that a crisis hotline has been established for members of the community seeking counseling.Quil Lawrence, NPR News, Newtown.A law enforcement official has now confirmed to NPRthat one of the dead is the principal of Sandy Hook Elementary School where the tragedy occurred.President Obama used his weekly media address to mourn the victims,saying the nation's hearts are broken, he said something must be done to avert future tragedies."Any of these neighborhoods could be our own,so we have to come togetherand we are going to have to take meaningful action to prevent more tragedies like this from happening, regardless of politics."Speaker of the House John Boehner said Republicans would forego their weekly media address todayso that President Obama might speak for all of the nation in his remarks.