The suspect went inside a home in Jonesboro in northeast Arkansas and shot six people inside, including two fatally, the Arkansas Democrat-Gazette reported.
Three among the six victims are children, and two of the four injured are in critical conditions, Xinhua reported.
The gunman then went to a shop after leaving the home, and shot dead another man, the report said.
The gunman was found dead from a gunshot wound at his car late Saturday. It's not immediately known whether his wound was self-inflicted or not.
Authorities haven't identified the victims or the purported gunman. They haven't released any information on a possible motive of the killing either. No other details are available now.