Four people were reportedly killed in an apparent terror attack at a synagogue in the Har Nof neighbourhood of Jerusalem Tuesday morning, a media report said.
A Magen David Adom spokesman said that there were at least 13 victims, some of whom are gravely injured, Xinhua reported citing Israeli media.
"We are viewing this as a terrorist attack," police spokesman Micky Rosenfeld said.
Two Palestinians, armed with axes and knives, entered the synagogue and began attacking worshippers. Both attackers were shot and killed, Channel 2 reported.
The ultra-Orthodox Har Nof neighbourhood is on the western edge of Jerusalem.