Deaths due to gang violence included people hit by stray bullets, cases of mistaken identity by the shooter, and relatives of targeted gang members. Twenty-three innocent bystanders have been killed and 30 wounded in gangland shootings in Sweden over the past three years, according to statistics that highlight the country’s battle to rein in violent crime. Sweden has struggled for more than a decade to contain gang violence linked primarily to score-settling and battles to control the drug market. The innocent victims include people hit by stray bullets, cases of mistaken identity, and relatives of targeted gang members, according to the police statistics released on Monday.…