According to Palestine.online website, the move was meant to show Bahrainis’ objection to the Manama conference.
The so-called "Peace to Prosperity" workshop opened in Bahrain on June 25 and will run through June 26.
The Palestinian leadership is boycotting the meeting, leading critics to question the credibility of the event.
The Palestinian Bar Association (PBA) plans to file a lawsuit against participants in the US-led conference in Manama.