minori takao, nhk world. >>> wednesday marked the 30th anniversary of japan's worst ever air disasterhe accident, a jet liner crashed into a mountain near tokyo, claiming the lives of 520 people. friends and relatives of the victims have journeyed to the crash site to pray and attend a memorial ceremony. people of all ages from children to the elderly climbed up northwest of tokyo. they laid flowers and offered prayers for their loved ones at a memorial marking the crash site. [ bell tolls ] >> translator: i've been coming here for 30 years to see my brother. and i've come this year too. >> translator: my son was born the year i lost my younger brother in the crash. my son got married, so he came here to introduce his wife to my brother. >> a japan airlines boeing jumbo jet went into the mountain on august 12, 1985. it was heading for osaka from tokyo. only four people survived the crash. investigators concluded that the rear pressure bulkhead came apart during the flight, making the plane uncontrollable. about 360 people gathered at the foot of the mountain for a memorial ceremony. p

. >> thanks, minori. >> one survivor has transformed her personal experience into a global campaign. she's revisiting her hometown to reaffirm her vow to tell the world about what people have there suffered. nhk reports. >> reporter: she's long been active in international struggle to abolish nuclear weapons. earlier this year, the 83-year-old survivor made a presentation at the u.n. conference to review the nuclear non-proliferation treaty. >> i demand the leaders of all nations ban nuclear weapons, ban nuclear weapons now. thank you. [ applause ] >> reporter: she came back to hiroshima this time to pay for those who died in the bombing. >> i just wanted to be with my own people, the spirits of my loved ones who have gone, i just wanted to be back here, here i am, i'm home, and i'm with you. >> reporter: she was reunited with one of her classmates. they visited the place where they were at the time of the bombing. this is the first time she's returned to this area in sencht years. she was 13 years old and had working at the military facility. when the bomb exploded, she was blinded