Palestinian hospital officials say gunmen have shot and seriously wounded a senior security officer allied with President Mahmoud Abbas.
Authorities say the assailants opened fire on Hassan Jarbouh Saturday in the Rafah refugee camp, in the southern Gaza Strip near the border between Gaza and Egypt.
Two other people, including a body guard and a young girl were also wounded in the attack.
There was no immediate claim of responsibility, but the shooting appeared to be the latest in the widening factional fighting between Hamas gunmen and security forces loyal to the Palestinian president, who belongs to the Fatah faction.
Tensions have been high in Gaza since Mr. Abbas called for early Palestinian elections.
Clashes between Hamas and its rival, Fatah, killed one person and wounded six others on Friday.
The fighting tested a three-day old ceasefire aimed at avoiding a Palestinian civil war.
Hamas and Fatah have been locked in a power struggle since Hamas won elections last January.
Some information for this report was provided by AP and Reuters.