Noblesville police are investigating two robberies, both involving elderly victims, by a man seeking money and drugs. The first happened about 11:30 p.m. Saturday in the 1800 block of Hannibal Street. William Story, 69, said someone knocked on his door. When he opened it, he was attacked. He was struck several times in the head when he fought back. A similar incident occurred at 3:36 a.m. Sunday in the 100 block of Queens Lane. Patricia Meredith, 65, woke up and found a suspect robbing her residence. He demanded money and pills before fleeing.