"The occupation forces arrested some 180 displaced from the Al-Harthani school in the northern Gaza Strip during ongoing aggression," the Prisoners Media Office NGO said in a statement.
The statement, however, did not provide details on how or which day the Palestinians were arrested.
Witnesses told Anadolu that the Israeli army targeted several shelters in the camp and arrested dozens of people.
On May 12, the army started a wide-scale military operation against the camp during which it destroyed homes and forced residents to flee areas in the camp.
Israel continued its brutal offensive on Gaza despite a UN Security Council resolution demanding an immediate cease-fire.
More than 35,850 Palestinians have been killed in Gaza, the vast majority being women and children, and nearly 80,300 others injured since October following an attack by Hamas.
More than seven months into the Israeli war, vast swathes of Gaza lay in ruins amid a crippling blockade of food, clean water and medicine.
Israel is accused of “genocide” at the International Court of Justice, which has ordered Tel Aviv to ensure its forces do not commit acts of genocide and take measures to guarantee that humanitarian assistance is provided to civilians in Gaza.