Israeli police on Monday arrested the three brothers of an East Jerusalem man who stabbed and wounded two police officers outside the capital’s Old City earlier in the day.

The three were suspected of expressing support for the stabbings, and police were investigating whether they helped their brother plan and carry out the attack.

The assailant, 20-year-old Ayman Kurd, a resident of the Ras al-Amoud neighborhood, was shot and critically wounded during the attack, police said.

A 38-year-old policewoman was seriously wounded in the assault, and a 45-year-old policeman sustained moderate injuries.

Channel 2 television reported Monday night that the policewoman was in very serious condition, and had undergone a series of operations on her neck and spine. She was expected to remain in serious condition in the coming days, the report said. Her colleague was in stable condition with moderate wounds.

Footage from a security camera at the scene shows Kurd approaching the officers from behind, and stabbing them repeatedly before being shot by the male officer.

The woman officer was taken to Shaare Zedek Medical Center in Jerusalem, while the policeman was taken to Hadassah Hospital Ein Kerem in a conscious state with multiple stab wounds to his upper body.

Also Monday, Border Police officers shot and killed two Palestinian men apparently attempting to carry out a stabbing attack near the Tomb of the Patriarchs pilgrimage site in Hebron.

They approached the officers before taking out knives and attempting to stab a group of them. The Border Police officers opened fire at the assailants, hitting both of them, police said.

One was pronounced dead a short while later, while the other was taken to Jerusalem’s Shaare Zedek Medical Center in critical condition and died of his wounds a few hours later.

One of the knives allegedly used in an attempted stabbing attack near Hebron's Tomb of the Patriarchs holy site on September 19, 2016. (Israel Police)

One of the knives allegedly used in an attempted stabbing attack near Hebron’s Tomb of the Patriarchs holy site on September 19, 2016. (Israel Police)

Later in the evening IDF soldiers foiled another attempted stabbing in Hebron. There were no injuries to the soldiers or the assailant, who was overpowered by troops and taken in for questioning.

The stabbings came after six attacks over the weekend — four stabbings, a car ramming and a rock throwing — caught many Israelis by surprise, as the violence that marked 2015 and early 2016 appeared to have waned in recent months, and raised fears that regular attacks could return.

In the past year, Israel saw a wave of so-called “lone wolf” Palestinian terror attacks, which claimed the lives of 35 Israelis and four foreign nationals since October 2015. Over 200 Palestinians have also been killed in the past year, with the Israeli army and police saying that most of those killed were attackers or involved in clashes with security forces.