常時英心:言葉の森から 1.0

約10年間,はてなダイアリーで英語表現の落穂拾いを行ってきました。現在はAmeba Blogに2.0を開設し,継続中です。こちらはしばらくアーカイブとして維持します。

young children unaccounted for in major citie

account for~は「〜を占める,説明する」などの意味が思い浮かびますが,見出しのunaccounted for~はどのような意味合いでしょうか。gachaくん,お願いします。(UG)
355 young children unaccounted for in major cities across Japan
Authorities in 35 major cities and wards across Japan are unable to confirm the safety or whereabouts of 355 infants between the ages of 0 and 3, a Mainichi survey has found.
Families moving without changing their residence certificates is seen as one of the reasons for the lack of information. Since there is a risk of child abuse stemming from poverty and isolation in cases where children's safety cannot be confirmed, authorities are likely to come under pressure to quickly address the situation.
http://mdn.mainichi.jp/mdnnews/news/20100921p2a00m0na013000c.html