Sheikh Ali Salman's arrest on Sunday has been widely viewed as an escalation that is likely to deepen the political standoff between the Arab nation's majority Shiite population and its Sunni-led monarchy.
Public prosecutors today said Salman would remain in custody for another seven days pending further investigations into statements that allegedly incited violence. The prosecution announced Salman's week-long detention on its official Twitter page, but did not mention Salman by name.
The EU said his arrest "carries the risk of jeopardizing an already difficult political and security situation."
Both the UN and EU statements said dialogue and national reconciliation were the only way out of Bahrain's current crisis.
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Bahrain's Attorney General Nayef Mahmoud said that prosecutors were following up on Interior Ministry accusations that Salman incited people to break the law, promoted political change through illegal force, incited hatred against specific segments of the society and defamed a governmental body.
The group has played a leading role in the mostly Shiite-led protests that erupted in February 2011 demanding greater power-sharing between elected lawmakers and the Sunni monarchy, the release of political prisoners and a prime minister chosen by elected officials and not the king.
Hundreds of protesters took to the streets for the third day this week to demand his release.
Salman's defense lawyer Abdulla al-Shamlawi told The Associated Press he is being accused of inciting hatred against the monarchy and calling for its overthrow in a series of speeches made since 2012.