Two people were killed Saturday during clashes between supporters of the ruling Islamic militant group Hamas, and the Fatah movement of president Mahmoud Abbas. Witnesses say one of those killed was a police officer, and the other was a bystander caught in the crossfire.
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At least 15 people were killed Friday.
Fatah and Hamas blame each other for the breakdown in the unity talks, and they say discussions are suspended until the fighting ends.
The latest found of violence erupted Friday, the first anniversary of Hamas' victory in Palestinian elections.
Palestinians hope a unity government would persuade Western donors to resume aid that was cut off after Hamas took power. Hamas refuses to renounce violence or recognize Israel.
The United States, the European Union and Israel classify Hamas as a terrorist organization.
Some information for this report was provided by AFP, AP and Reuters.