Israel's Supreme Court has rejected an appeal by the family of pro-Palestinian American activist Rachel Corrie, who was killed over a decade ago in Gaza.

The family had challenged a lower court's ruling in 2012 that exonerated the government of all wrongdoing.

Corrie, who was 23, was crushed to death in March 2003 as she tried to block an Israeli military bulldozer in the southern Gaza town of Rafah. The incident occurred at the height of a Palestinian uprising, a time of heavy fighting between the military and Palestinian militants.

Her supporters believe the Israeli government should be held accountable for Corrie's death.

The court said the state was not liable as the incident happened in a combat zone.