At least four Hamas fighters have been killed in an Israeli air strike on a compound used by the Islamist group's executive force in Gaza City.
Medical workers and Hamas officials said at least 20 other people were wounded in the blast.
Meanwhile, Israeli forces are reported to have seized a cabinet minister belonging to the Hamas-led Palestinian unity government in the occupied West Bank.
A Palestinian security official said that Minister of State Wasfi Kabha, a Hamas member, was arrested overnight from a village near the city of Jenin.
He is the second cabinet minister to be seized by Israeli forces since Thursday.
The Israeli army said it arrested a Hamas member overnight, but did not identify him.
