[originaltext] Four American teenagers, all children of U.S. military person

Four American teenagers, all children of U.S. military personnel, [3]have been arrested on charges of attempted murder after a woman was knocked off her motorbike with rope strung across two poles, Japanese police said.
    The four suspects—two 15-year-old boys, a 17-year-old girl and an 18-year-old man—were arrested on Saturday, the Tokyo Metropolitan Police Department said.
    [3]They are accused of causing a severe head injury to a 23-year-old restaurant employee by stringing a rope between poles across a road.
    [4]U.S. Forces in Japan was informed of the August incident in late October, a public information officer said. There was no clear explanation for the delay in the handover of the suspects to police, other than it involved rules between Washington and Tokyo covering U.S. forces and their dependents in Japan.
    The U.S. military presence and its impact on Japanese residents have been a troublesome issue over the years.
3. Who was the victim according to the news report?
4. When were the suspects arrested?