The son of Palestinian Prime Minister Ismail Haniyeh was shot and wounded during a battle at the Rafah crossing point, Palestinian official Taher Nunu said.
He was not seriously wounded, officials said.
Hamas followers of Haniyeh exchanged fire with rival Fatah forces several times during the day, and the gunfire continued as Haniyeh's convoy passed through the checkpoint from Egypt after a long wait.
Israel had banned him from entering Gaza with millions of dollars in cash.
Join Jerusalem Post Premium Plus now for just $5 and upgrade your experience with an ads-free website and exclusive content. Click here>>