Israeli troops fired warning shots towards Palestinian youths gathered at the Gaza-Israel border on Saturday, wounding 13 people, health officials said.
Tension remained high in the area a day after deadly violence broke out in one of the biggest Palestinian demonstrations there in years.
An Israeli military spokesman said he was checking the details of Saturday's unrest.
On Friday at least 15 Palestinians were killed by Israeli security forces confronting protesters, some of whom the military said had opened fire, rolled burning tyres and hurled rocks and fire bombs toward troops across the border.
Palestinian President Mahmoud Abbas declared Saturday a national day of mourning and a general strike was called across the occupied West Bank. Thousands in Gaza marched through the streets at funerals for those killed.