The Palestinian Authority has arrested dozens of Hamas members in the West Bank in the past two weeks, including the son of a top bombmaker killed by Israel, Palestinian sources said Tuesday.

The sweeps are part of an ongoing crackdown on the group and other Islamists since the end of Israel’s war with Hamas-led fighters over the summer, while Hamas forces have made arrest raids on Fatah members in the Strip, in a sign of faltering unification efforts despite a pact signed between the rival groups last year.

One of the Hamas members pulled in was named as the son of Yahya Ayyash, a master bombmaker known as “The Engineer” who led the organization’s military wing until his assassination in 1996.

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Baraa Ayyash was arrested in Nablus three days ago by members of the Palestinian Preventative Security apparatus.

In a similar manner Hamas security forces in the Gaza Strip have, over the past two weeks, arrested dozens of activists from Fatah, the political party of Palestinian Authority President Mahmoud Abbas.

Hamas official Mahmoud al-Zahar condemned the arrest of Baraa Ayyash and said that Abbas was responsible for what he termed a criminal act.

“It is historical revenge on the martyr,” Zahar wrote on his Facebook page.

Yesterday marked exactly 19 years since Baraa’s father was killed by Israel.

Ayyash, from Kfar Rafat in the northern West Bank, was killed by a booby-trapped exploding cellphone that delivered to him by the Israeli Shin Bet security service while he was in Gaza.

He was considered responsible for designing the bombs used in a number of deadly suicide attacks against Israel.