Leave it to the BBC to use a passive voice when Palestinians kill other Palestinians in the West Bank. They just can't acknowledge their internal blood-letting.
The Beeb's headline style is unfortunately consistent, a problematic pattern HonestReporting noted in a one-year study which found:
In 63% of the stories about Israeli operations, Israel or the IDF were named directly. Typical headlines were: "Israelis kill militants in Gaza" (The "militants" had been firing rockets into Israel), "Children killed in Israeli strike" (the children were playing next to a rocket launcher), and "Israeli strike kills four in Gaza."
On the other hand, of the seven stories concerning Palestinian attacks, none were written in the same style. The headlines took the responsibility for the attacks away from those who instigated them. Rockets, explosions,and clashes became the culprits in typical headlines such as: "Rocket injures dozens in Israel," "Gaza explosion kills two children" (compare with headline above), "Two killed in clash in Gaza Strip," and "West Bank clash leaves three dead."
In the skewed world of BBC headline writers, Palestinians never kill other Palestinians.