Hamas says it has rounded up dozens of Fatah activists in Gaza, a day after a huge rally commemorating Yasser Arafat ended in gunfire killing seven people.Witnesses say security forces opened fire on unarmed crowds after the rally turned into a protest against the Hamas movement's takeover of Gaza in June.
Hamas says its police came under attack from Fatah gunmen and returned fire.
Fatah party officials allege 400 of their supporters were arrested and dozens more summoned for questioning.
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