JERUSALEM (AP) — Israel has jailed a Jewish extremist for six months without charges or trial, expanding a crackdown against militant Jews and deploying a contentious measure typically used for Palestinians suspected of planning attacks.

It is the first time the measure, known as administrative detention, has been applied to an Israeli since the crackdown began following a pair of deadly attacks last week.

Defense Minister Moshe Yaalon signed an order late Tuesday that jailed Mordechai Meyer, an extremist from the West Bank settlement of Maaleh Adumim, for six months.

A statement from Yaalon’s office said Meyer, 18, was being held in connection to “his involvement in violent activities and recent terror attacks.”

The ministry would not elaborate, but Israel’s internal security agency, Shin Bet, said Meyer was among five people arrested in connection with the arson attack against a well-known church in northern Israel in June. Meyer was not indicted but two others were.

Meyer was also suspected of links to attacks against another church in Jerusalem, as well as attacks on Palestinian property, the agency said, adding that he had previously been banned from the West Bank and Jerusalem. The Shin Bet declined to comment on whether Meyer was connected to last week’s attack on a Palestinian home.

The detention marks an intensification of a crackdown on Jewish militancy after the two deadly attacks last week.

On Friday, suspected Jewish extremists torched a West Bank home, an arson attack in which a Palestinian toddler was burned to death and his parents and 4-year-old brother were seriously wounded. A day earlier, an anti-gay ultra-Orthodox man stabbed six people at Jerusalem’s gay pride parade, and one of them — a 16-year-old girl — later died of her wounds.

Jewish extremists have for years vandalized or set fire to Palestinian property, as well as mosques, churches, the offices of dovish Israeli groups and even military bases. The so-called “price tag” attacks seek to exact a cost for Israeli steps seen as favoring the Palestinians.

Prime Minister Benjamin Netanyahu has pledged “zero tolerance” for Jewish terrorism and Israel has authorized a series of steps, including administrative detention, to help stamp out the trend.

On Tuesday, authorities arrested Meir Ettinger, a high-profile activist accused of leading a new movement of settler youths who embrace violence and reject the rule of law in the name of the purity of the Holy Land.

Ettinger, 23, was not being held under administrative detention but was arrested for “involvement in an extremist Jewish organization.” The Shin Bet would not say if Ettinger is also suspected in the West Bank arson attack.

Administrative detention is typically used against Palestinians, who can be held for months or even years without charge or trial. The measure is rarely applied to Israelis. Israel has defended the administrative detention of Palestinians as a necessary tool for preventing militant attacks.

Meyer’s lawyer, Adi Keidar, told Israeli Army Radio that there were “less drastic steps” Israel could use to pursue an investigation against his client. He said he opposed the measure, both for Israelis and Palestinians.

“Legally speaking, you can’t take a person and put him in jail, without having evidence against him,” Keidar said.

The Palestinians are also taking action to try to prevent future attacks. The Palestinian leadership has begun forming civilian patrol groups across the West Bank, where Palestinians who say they feel unsafe are hoping to ward off attacks by Jewish extremists.

These self-defense committees are expected to be established in some 100 villages in an area of the West Bank in which Israel has full control over security, according to Gassan Daghlas, a Palestinian official in the city of Nablus who is in charge of monitoring attacks by Jewish extremists.

Palestinian security forces cannot operate in that area, known as Area C, without coordinating with Israel first.

The groups scour the outskirts of their villages carrying bats and flashlights and looking out for any encroachers. If they spot suspicious activity, the village’s mosque blares out a warning to residents to be on guard.

The self-defense groups have been formed previously after attacks, but their patrols tend to peter out because the members are volunteers and their effectiveness is limited.

“Now there is a real need for such groups as the (Jewish extremists) are escalating their attacks,” said Daghlas.

The Israeli military had no immediate comment about the civilian patrols.

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Associated Press writer Mohammed Daraghmeh contributed reporting from Ramallah, West Bank.