If everyone's keeping silent about the issue, how can the UHCR talk like there's absolutely no other explanation for this? And no, the wife's "I'm sure it was Israel and my husband told me so!" doesn't count as evidence regardless of it actually being true or not. The title makes it sound like there's official confirmation on the issue.
Israeli soldier lightly wounded after being hit by car south of Hebron (Haaretz)
from the article: UN official: Israel kidnapped Palestinian engineer from Ukraine