A Milwaukee police officer shot and killed a man they say refused to drop a gun.The Milwaukee Police Department said officers responded to a shots fired call near South 29th Street and West Cleveland Avenue around 10:30 p.m. Sunday.Police said officers arrived at the home and saw an armed man on the front porch. The man then went to the back porch and fired shots, officers said.According to MPD, the officers told the man to drop the gun, but