Palestinian officials say fighting between Hamas and a powerful family in the Gaza Strip has killed 11 people and wounded several others.
Tuesday's violence began when Hamas police tried to arrest members of the Doghmush clan accused of killing a police officer Monday.
Residents say the fighting is ongoing with heavy gunfire and explosions. At least one police officer has been killed.
Last year, Hamas seized control of the Gaza Strip after routing Fatah forces loyal to Palestinian President Mahmoud Abbas.
Since then, Hamas has clashed several times with rival Palestinian groups and powerful Gaza families.
Several Doghmush family members are suspected of belonging to militant groups and being involved with the kidnapping of a BBC journalist last year.
Some information for this report was provided by AFP and AP.