Four Egyptian activists who were reportedly placing posters in a Cairo metro to visualise opposition to the recently signed Egyptian-Saudi Red Sea island have been questioned on Tuesday by South Cairo prosecution.
The activists were arrested on Monday inside the Helwan metro station in south Cairo as they were placing the posters.
The four arrested include Khaled Bassyouni, the son of Mohamed Bassyouni, the general-secretary of the Nasserist Al Karama Party founded by former presidential candidate Hamdeen Sabahi.
Last month, a deal signed by Cairo and Riyadh - which transfers sovereignty over two islands in the Red Sea, Sanafir and Tiran, from Egypt to Saudi Arabia - caused widespread controversy and several protests throughout Egypt, which ended in the arrest and jailing of tens of protesters.
Members of Al Karama Party started last week a sit-in at the party's headquarters against the Egyptian- Saudi deal and the jailing of its opponents.
Sabbahi and other senior members of the party and supporters are taking part in the sit-in.
Last week, an Egyptian court sentenced more than 150 people to between two and five years in jail for their participation in the protests.