Amid renewed debate over gun crime and weapon ownership in America, there have been two more shootings.<br /><br /> In Detroit, one man was killed and nine other people wounded when a shooter opened fire at a neighbourhood party being held on a basketball court. <br /><br /> Authorities suspect the 20-year-old dead man was targeted, but investigations are continuing. <br /><br /> Meanwhile, in Philadelphia, seven people,including three children, have been wounded in a shooting at a picnic party. <br /><br /> US presidential hopeful Hillary Clinton has called for “commonsense” gun reforms in the wake of the Charleston church shootings. <br /><br /> Legislation that would have expanded checks on firearms sales was rejected by Congress two years ago, after the Sandy Hook school killings.