Israeli soldiers shot dead a 13-year-old Palestinian schoolgirl in the southern Gaza Strip on Tuesday after she approached an army watchtower in a tense border zone, witnesses said. Palestinian medics said she had been hit by 20 bullets. Iman al-Hams and two other girls, all of them wearing school uniforms, passed a watchtower in Rafah refugee camp near the Egyptian border, a scene of frequent violence in a 4-year-old uprising, Palestinian witnesses said. "Israeli soldiers stormed the area, the girl left the bag and tried to run," said one. "Bullets hit the bag and then soldiers opened fire on the girl."