Eden Attias, an Israeli soldier, was stabbed to death today by a Palestinian on a bus in the northern Israeli city of Afula. The Palestinian, identified as Hussein Jawadra, 16, reportedly admitted that he carried out the attack as revenge for the imprisonment of relatives by Israel.

One relative is serving three life sentences for murdering two Israelis, while the other is serving a 12-year sentence for attempted murder, Ynet News reported. Jawarda, according to Israeli media reports, was originally from the West Bank city of Jenin, but had illegally entered Israel.

Israeli authorities currently believe that Jawarda acted alone, Channel 10 reported. “These attacks are very difficult to prevent because they are usually made by a single person and usually not planned in advance. Therefore, intelligence is very hard to get.” one official said.