The Israel Police mistakenly arrested a Palestinian worker last week because they relied on automatic translation software to translate a post he wrote on his Facebook page. The Palestinian was arrested after writing “good morning,” which was misinterpreted; no Arabic-speaking police officer read the post before the man’s arrest.

Last week, the man posted on his Facebook page a picture from the construction site where he works in the West Bank settlement of Beitar Ilit near Jerusalem. In the picture he is leaning against a bulldozer alongside the caption: “Good morning” in Arabic.

The automatic translation service offered by Facebook uses its own proprietary algorithms. It translated “good morning” as “attack them” in Hebrew and “hurt them” in English.