Hamas says one of its members has been killed in an explosion at a house near Gaza City.
The militant group said the man died while on "a holy mission" - a term often used when a member dies accidentally while handling explosives.
Two teenage boys were wounded in the blast at the militant's home.
In the West Bank, Palestinian officials say Israeli troops have arrested a Hamas member of parliament from the city of Nablus.
Mona Mansour and 19 other people were detained.
Israeli troops have in recent weeks raided Nablus almost daily in a crackdown on Hamas.
Across the West Bank, Israeli forces have closed down several institutions allegedly linked to Hamas.
Dozens of Hamas MPs have been detained by Israel since the militant movement won Palestinian legislative elections in January 2006.
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