el-bireh west bank reuters photographer mohamad torokman find star barrel gun capture moment undercover israeli military group shut palestinian protest rarely witness infiltration technique photo essay reut.rs/2ap07mi torokman assignment near jewish settlement beit el close palestinian hub city ramallah wednesday protest underway u.s. president donald trump decision recognize jerusalem capital israel hundreds turn do days follow trump announcement burn tire others hurl stone israeli troop oblivious surprise military move await undercover personnel pose palestinian protesters stand behind stone-throwers say torokman cover clash region nearly two decades sudden start fire pistols air throw sound grenades time din grenades gun cause panic among protesters torokman saw eight israeli personnel wear mask fashion arab headdresses palestinian flag leap action detain protesters keep photograph thereby capture moment undercover agent grapple protester swing round briefly point gun directly torokman shout tell go away say torokman describe atmosphere terrify heed order safety quickly move away remain protesters flee uniform israeli troop move torokman take photograph safe location incident less five minutes third time torokman saw first hand work undercover commandos know hebrew mistaravim arab disguise far scary level risk high time personnel aim weapons say undercover israeli agents action