JERUSALEM — A Jewish teenager in Israel made a wave of threats to Jewish institutions in the United States and other countries in recent months, contributing to widespread fears of a spike in anti-Semitism, law enforcement officials said, after an international investigation culminated on Thursday in the arrest of the man, whose lawyer said he suffered from a brain tumor that affects his behavior.
A spokesman for the police here, Micky Rosenfeld, said the 18-year-old suspect, who holds dual Israeli and American citizenship and lives in the Ashkelon area of southern Israel, had made threats to Jewish community centers and other sites in the United States, Australia and New Zealand, and to at least one commercial airline flight, forcing an emergency landing. His motives were not immediately clear.
“This is the guy we are talking about,” Mr. Rosenfeld said.
A judge ordered the suspect, who has not been charged, held until at least March 30, ordered a medical examination and imposed an order of silence forbidding Israeli authorities to release his name.