A powerful explosion ripped through a car on a busy Gaza City beach Friday night, killing four and injuring 20, Hamas security officials said, hours after two previous blasts left an additional Gazan dead.
The Hamas armed wing issued a statement blaming "members of the fugitive party" - a derogatory term for Fatah - for Friday night's blast at a major junction outside Gaza City.
"We have information that some elements are planning to carry out bombings against the interests and leaders of Hamas in order to sow anarchy," said senior Hamas leader Khalil al-Hayya, whose son, himself a gunman, was wounded in the blast.
No group claimed responsiblity for the blasts.
The late night explosion killed Amar Musubah, a Hamas military field commander, Hamas militant Eyad Al-Hia, a child and a fourth unidentified individual. All the wounded were civilians, medical officials said.
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Gaza has been relatively quiet over the past month because of a cease-fire between Israel and Hamas that went into effect in mid-June.
But the cease-fire has stoked some tensions between Palestinian factions as Hamas has sought to prevent other groups from firing cross-border rockets at Israel.
Gaza also sees internal Palestinian violence, some of it carried out by fundamentalists who oppose what they see as signs of Western cultural encroachment.
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