Two Palestinian teenagers stabbed an Israeli boy in northern Jerusalem on Monday, according to police.
Medical officials said the 2 teenagers, aged 12 and 15, were killed near Khan Younis.
Four Israelis and 26 Palestinians, including eight attackers and eight children, have died in 12 days of bloodshed in Jerusalem.
The heightened tension between Israelis and Palestinians has triggered by increasing Jewish visits to the al-Aqsa mosque compound in Jerusalem.
The first stabbing had been carried out by a 16-year-old Palestinian on Saturday, according to officials. Two Jewish men in their 60s were wounded.
Another Palestinian stabbed two police officers just outside the Old City, police spokesman said. Police opened fire and killed the assailant, but also wounded one of their colleagues.