Two Palestinians have been shot dead after infiltrating the Jewish settlement of Kfar Etzion and stabbing several students, according to an Israeli radio report.
Several students injured and some were taken to hospital on Thursday.
A resident of the settlement told Israel Radio that the two Palestinians were disguised as Israeli soldiers and were carrying knives and a pistol.
They were killed after Jewish settlers overpowered and shot them.
Settlements built on occupied Palestinian land are illegal according to international law.
In a second incident, Palestinian fighters shot and killed one police officer and wounded another near the Shuafat refugee camp in northern Jerusalem, Micky Rosenfeld, a police spokesman, said.
The wounded officer, a woman, was in critical condition, according to an ambulance service spokesman.