Nadim Injaz, the Palestinian man who has barricaded himself in the Turkish embassy on Tuesday, broke into the British embassy in a similar incident four years ago.Injaz scaled a wall adjoining the British embassy in Tel Aviv and pulled a gun, threatening to shoot himself if he did not receive asylum in a European country.RELATED:Gunman lightly wounded in Turkish embassy standoffAnalysis: A case that went very wrong for the Shin BetThe gun turned out to be made of plastic. Injaz has a troubled past, allegedly working for Palestinian security forces in mid-1990s after his brother was discovered to be an Israeli collaborator, and later as an Israeli informant himself.Injaz reportedly told a human rights researcher that he was promised Israeli identity papers by Israeli intelligence for his work as an informant, but they never came through on their side of the bargain. Since then he has been in and out of Israeli prisons on petty criminal charges or for lacking identity papers and repeatedly expelled to the West Bank, only to keep coming back to Israel.On Tuesday, Channel 2 first claimed Injaz was a former collaborator with Israel from Ramallah, who had been pressured by the Shin Bet into attempting to kill Fatah leader Marwan Barghouti. Since he refused to do so, he claims, the Shin Bet has been seeking his demise. Recently, it left him at a West Bank crossing point, but he refused to cross into PA-controlled territory, fearing he would be killed there.Channel 2 later said the suspect's claims regarding Barghouti and the Shin Bet were baseless.