Israeli security forces uncovered over 200 pounds (about 100 kilograms) of bomb-making supplies in a Palestinian village in the northern West Bank early Monday morning, the army said.

The discovery was made in a home in el-Far’a, northeast of Nablus, by troops during a joint operation between police, the Israel Defense Forces and the Border Police gendarmerie.

The army did not detail what the explosive precursor was, calling it “materials used to manufacture explosives.”

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Troops also uncovered 1.6 quarts (1.5 liters) of prepared explosive material, the IDF said in a statement.

The materiel was found in the home of a man who had already been arrested by IDF troops, an army official told The Times of Israel.

In a separate raid, the army uncovered two pipe bombs and two Molotov cocktails in a home in Bayt Awa, a Palestinian village in the southern West Bank.

The owner of the home was detained by Israeli troops and taken for questioning, the official said.

The explosives and bomb-making materials were confiscated by security forces, the army said.

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Four other Palestinians were arrested in unrelated raids for allegedly taking part in “popular terror and violent riots against civilians and security forces,” the army said.

One was arrested in Bayt Rima, one in Bita and two were picked up in Sa’ir. Upon their arrest they were handed over to the police and Shin Bet security service for questioning.

In December, IDF troops and Shin Bet agents raided a laboratory allegedly used by Hamas to create explosive devices.

In late 2015, security forces arrested more than two dozen suspected Hamas operatives in connection with the laboratory, the majority of them Al-Quds University in Abu Dis students, whom they suspect were preparing to attack Israeli targets, the agency said in a statement at the time.