The Israeli army on Tuesday arrested 21 Palestinians during raids on several West Bank towns.
The Palestinians were arrested "from their homes" mostly in Ramallah, Nablus, Jenin, Bethlehem and Hebron, Xinhua news agency reported citing a statement issued by the Prisoners' Club Association.
The Israel Defence Forces (IDF) confirmed that 17 wanted Palestinians "suspected of being involved in militant activities and violent and disorderly conduct" were arrested overnight in the West Bank.
It said that Israeli forces, along with local police, found a weapons manufacturing lab in Hebron.
The Israeli army has carried out almost daily raids in West Bank, saying those arrested were planning attacks on Israel.
Since early April, the Israeli army has arrested 80 people, including a 22-year-old woman, the Prisoners' Club Association said on Tuesday.