Survivors of Norway's deadliest massacre are urging the United States to tighten up gun laws to put an end to school shootings. In Sweden, sporadic gang-fueled gun crime just helped install a far-right party in power. Both countries have relatively high levels of firearms ownership but low levels of gun-related homicides. Malcolm Brabant went to see if there are lessons America can learn. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders