Authorities knocked on doors in search of video and sifted through snow and dumpsters for other evidence that might lead them to the Brown University gunman, whose face was covered or not visible in footage captured before and after the weekend attack that killed two students and wounded nine others.
Officials on Monday released three new videos of the man they believe carried out Saturday's attack that show him wearing a mask and a dark two-tone jacket. Although his face wasn't visible, the footage from about two hours before the shooting provided the clearest images yet of the suspect.
