Maryland shooting: Woman kills three and turns gun on herself

 A woman shot dead three people and injured three more before turning a gun on herself in an attack at a warehouse complex in Maryland, US police say. 

 She owned and had registered the handgun, and had taken several magazines of ammunition with her, police said.The sheriff's office initially urged residents to avoid the area, which is about 40km (25 miles) north-east of Baltimore.But it later tweeted that "we do not believe there is any further threat to the community".