( CNN ) -- Norway 's Alexander Dale Oen won gold in the 100m breaststroke in an emotional day of medal winning at the FINA World Championships in Shanghai . The 26-year-old pointed to a Norwegian flag in reference to the shootings in his home country on Friday that claimed the lives of over 90 people . `` It 's a very special medal after what happened in my country in the last days , '' he told FINA 's official web site after his victory . `` Seeing the flag , hearing the national anthem , everything was coming back and even though it 's been three days , it is still a shock . '' Elsewhere , tears were shed when the Brazilian Cesar Cielo won the 50 meters butterfly , but not from all quarters . Cielo had been banned for alleged doping offences earlier in the year but , after taking his case to the Court for Arbitration in Sport ( CAS ) , the ruling was overturned four days before the race . As Cielo wept during the medal ceremony , other swimmers made pointed gestures , unhappy at his appearance . It was reported that some members of the crowd jeered his victory too . `` This gold has definitely a different taste than the other ones . That was probably the hardest medal in my life ; I knew I was going to race against the world 's best , and to be able to compete after what I have been through this last month is really a blessing , '' Cielo told FINA 's official web site . `` With what happened , it was a time to test how much I could take and if I would be able to stand up again , and I am really proud of myself for doing this . Medals are important but I can not imagine my life without the environment of swimming . '' The U.S. and China won their first gold medals when American swimmer Dana Vollmer triumphed in the 100m butterfly and 15-year-old Shiwen Ye secured the 200 meter individual medley for the hosts .
Norway 's Alexander Dale Oen wins gold at the FINA World Championship . The 100m breaststroke champion held back tears . The victory was good nation for a nation rocked by tragedy . Score: 6