said 100,000 participated in the march while opposition activists estimated the number to be more than 200,000. The march was called for by Sheikh Isa Qassim, Bahrain's top Shia cleric. Protesters called for downfall of King and the release of imprisoned political leaders. The protest ended peacefully, however hundreds of youth tried to march back to the site of the now demolished symbolic Pearl roundabout, and were dispersed by security forces with tear gas. Nabeel Rajab, president of BCHR called the march "the biggest in our history". Information Affairs Authority said the march was "a prime example of how freedom of expression is guaranteed", while Isa Qassim said earlier during Friday sermons "This rally reflects the people's consensus on the political demands and their determination to not leave the streets until their demands are met". In Iraq, followers of Shia cleric Muqtada al-Sadr demonstrated in Basra in support of the Bahraini opposition. Around 3,000 people chanted anti-Saudi slogans and waved Bahraini and Iraqi flags. April 2012 April 10 On April 10, a homemade bomb in the Bahrani village of Al Eker exploded. Blaming protesters for it, Ministry of Interior said the explosion resulted in injuring 7 policemen. The attacked was condemned by Al-Wefaq, Bahrain's main opposition party, a number of local MP's, the UN Secretary General and Gulf Cooperation Council General-Secretary. Pro-government newspaper Akhbar Al Khaleej reported that a bus was burned by a "radical" group called "Asa'ib Althawra" using Molotov cocktails in Sehla. The attack on the bus had apparently been done by a group calling itself Asa'ib Althawra. The claim of responsibility for the attack was made on the group's Twitter account "Rebelsracebh". During the day, pro-government groups organized illegal gatherings near Alba Roundabout in the predominantly-Sunni town of Riffa. They also damaged two cars and attacked a 24-hour supermarket belonging to the Jawad company, whose owner is Shi'a. Another group tried to enter the opposition stronghold of Nuwaidrat but were prevented by police. April 12 On April 12, a gas cylinder exploded in the Al Ma'aridh road in Manama, damaging three cars. April 18 Four mechanics from the Force India Formula One team were in a van that was the target of a Molotov cocktail on Wednesday night. April 19 On Thursday night, a bus with 12 members of the Sauber Formula One team drove to the side of the road after seeing a burning bottle (Molotov