U.S. Secretary of State John Kerry told an Israeli gathering at the United Nations on Wednesday that a two-state solution in the Middle East was "not an impossible dream" but would require courage.

Kerry traveled to U.N. headquarters in New York to attend a commemoration of the 1975 speech delivered by Israeli ambassador Chaim Herzog denouncing a U.N. resolution that declared Zionism a form of racism.

A Palestinian related to a man suspected of being behind an anti-Israeli attack was killed by undercover Israeli agents in a West Bank hospital on Wednesday night, Palestinian and Israeli sources said.

"Abdallah Azzam Shalaldeh, aged 27, was killed by a unit of (undercover agents) at the Hebron hospital," said the Palestinian health ministry.

The head of the Palestinian team looking into the death of Yasser Arafat on Tuesday again accused Israel of assassinating the iconic Palestinian leader in a Paris hospital.

His comments came on the eve of the 11th anniversary of Arafat's death and two months after French judges closed an investigation into claims he was murdered, without bringing any charges.

Unrest returned to Jerusalem Tuesday after a lull of more than a week with two knife attacks, one near the Old City and another by alleged assailants aged 12 and 14.

There was also a knife attack in the West Bank.

General Security chief Abbas Ibrahim stressed that the security forces' pursuit of takfiri threats has not distracted it from confronting agents who are collaborating with Israel, reported al-Joumhouria newspaper on Tuesday.

He told the daily: “The General Security is combating terrorism, through its takfiri and Israeli guises.”

A Palestinian woman attempted to attack Israeli security guards with a knife at a checkpoint in the north of the occupied West Bank on Monday before being shot dead, officials said.

Guards fired warning shots after the woman was seen approaching a checkpoint near the city of Qalqilya with the weapon. She was shot after refusing to stop, the Israeli defense ministry said.

Israeli Prime Minister Benjamin Netanyahu said Sunday he planned to discuss defense aid with President Barack Obama as he left for his first meeting with the U.S. leader in over a year.

Netanyahu is due to meet Obama on Monday in Washington as the two leaders seek to set aside their testy personal relationship and turn the page after a sharp disagreement over the July nuclear deal between Iran and world powers.

General Security announced on Sunday the arrest of a spy network working for Israel.

It said that it arrested a Syrian, his Lebanese wife, and another Lebanese national in the South on espionage charges.

Car-ramming and stabbing attacks wounded six Israelis in the West Bank on Sunday while two alleged Palestinian assailants were shot, authorities said, the latest in a weeks-long wave of violence.

While violence had waned somewhat in recent days, the new attacks signaled that knife, gun and car assaults that began at the start of October were set to continue despite tough Israeli security measures.

Barack Obama and Benjamin Netanyahu will hold a post-row summit Monday, hoping a massive 10 year defense deal will help them move beyond a bitter public fight that shook a decades-old alliance.

After acerbic clashes over the U.S.-backed nuclear deal with Iran, the two leaders will discuss a deal expected to be worth more than $30 billion which will include a string of advanced weaponry systems, officials said.