Nine people in Ohio have been killed in the second mass shooting in the US in less than 24 hours, police said. The suspected gunman is also dead. Dayton police tweeted that an active gunman situation began in the Oregon District at 1am local time, but that officers nearby were able to "put an end to it quickly". Lt Col Matt Carper told a press conference that the suspect was shot dead by responding officers. At least 26 others were taken to local hospitals with injuries, police said.