Palestinian medical officials says Israeli forces have shot and killed a Palestinian farmer in the southern Gaza Strip. They say the shooting occurred after militants attacked Israeli army vehicles in the area. Palestinian militants say they fired mortars at the Israeli vehicles. The Israeli army isn't commenting, but medical officials say the attack prompted the Israeli forces to fire back. They say the dead man was a 65-year-old farmer who was on his land at the time. The shooting occurred near Kissufim, an Israeli crossing into the Gaza Strip.