"A group of gunmen opened fire at forces operating in the Nablus area and a gun battle ensued in which two of the gunmen belonging to Fatah were killed," the spokeswoman said.
 
She added that she was not aware of any other casualties on the Palestinian side.
 
Al Jazeera's correspondent in the West Bank said Israeli troops stormed houses during the raid in the city.
 
A local hospital said it received the bodies of two Palestinians killed in the incident.