Riot police used tear gas on Wednesday to disperse a small protest in the village of Boori injuring at least 4, including prominent activist Zainab al-Khawaja. The vice-president of the Bahrain Centre for Human Rights Said Yousif tweeted a picture of al-Khawaja showing her injury. She was reportedly hit by a tear gas canister in the leg as she was trying to protect an elderly woman. Three other demonstrators suffered minor injuries. The protesters, several dozens, including Said Yousif and Zainab al-Khawaja, were reportedly attacked less than 5 minutes after they started marching. According to Bahrain journalist Mazen Mahdi, journalists from AFP and AP were also stopped several times for ID. Bahraini authorities have banned a protest planned for Wednesday evening in Meshqa, West of Manama, without citing any reasons. The head of the Bahrain Centre for Human Rights was released on Wednesday morning after 21 days in detention. Nabeel Rajab was arrested on June 6 for criticizing the regime on the micro-blogging site Twitter. Despite his release the prominent dissident still faces charges of “inciting illegal rallies and marches online by using social networking websites”, he is to appear in court on July 9. Bahrain, which is ruled by a Sunni Muslim monarchy and hosts the U.S. Fifth Fleet, has been in turmoil since activists mainly from the majority Shi'ite community began protests in February 2011, inspired by successful uprisings in Egypt and Tunisia. More than a year later, unrest persists with weekly mass rallies by opposition parties and clashes between youth activists and riot police. Photos via @SAIDYOUSIF