A military military staff of the US Navy exploded, causing two serious people, then ran to the nearby military base and was shot dead.

Jason Lando, Frederick, Maryland, USA, Today said the gunman went into a business base of Riverside Technology Zone, causing the inside to run away, but it was unclear the shooting fire

The shooting scene in Frederick City, Maryland, USA, today.

After shooting, the two victims were seriously injured, the man driving about 10 minutes to the Fort Detrick military base.

The two injured victims were transferred by a helicopter to a hospital.

The US Navy has not announced more detailed information about the incident.

"All I can say is that we confirmed only one gunman. There are no threats for people anymore. Everyone is safe," Lando said.