The fragile ceasefire between Israel and Gaza militants is under threat today following an incident along the border in which Israeli troops fired on Palestinian protesters, killing one man and injuring 19 others.

It's unclear whether the troops were shooting to kill or firing to disperse the crowd. At least one

protester actually crossed into Israeli territory. The ceasefire agreement calls on Palestinians to respect a buffer zone between Gaza and the border fence.

In the video below, you can see protesters almost face-to-face with an Israeli soldier on the other side. Fox News correspondent Leland Vittert reported from Jerusalem, stating that Hamas is lodging a protest over the border violence with the mediators of the ceasefire.