Hundreds of thousands of Palestinians have flooded into Egypt, creating a dilemma for the government in Cairo, since a series of blasts broke through the border wall on Wednesday.
Violence erupted at the Rafah border on Friday after the government announced it would close the crossing.
Egyptian forces took up positions a few steps into Palestinian territory, using shields to protect themselves from some Gaza residents who climbed on to car roofs and threw stones at them.
The police responded with batons and water cannon and 22 were injured, according to state news agency Mena.
After Palestinian fighters bulldozed the new opening Egyptian forces pulled back.
"Egyptian border guards have no orders to engage with Palestinians and close the borders again," Al Jazeera's Amr el-Kahky, reported from Rafah.
"The last thing Egypt would like to be portrayed as would be as an Arab authority beating Arab civilians crossing the border."
The Egyptian government has been heavily criticed by Western powers for alllowing the border to remain open.
The US congress has suspended $100 million of aid to Egypt due to the border breach.
Israel tightened its blockade of the Gaza Strip last week saying the move was intended to counter cross-border rocket fire by Palestinian groups.
The closure of the territory led to dwindling supplies of food, fuel and other basic necessities.
Hosni Mubarak, the Egyptian president, has called the situation in Gaza "unacceptable" and called on Israel to "lift its siege" and "solve the problem".