Bahraini Muslims were faced with police raids when they gathered to cover walls with black clothes ahead of the mourning month of Muharram.
The security forces used tear gas canisters and sound bombs to disperse young people gathered in the streets of capital, Manama.
During the lunar month of Muharram, Shiite Muslims mourn the martyrdom of their Imam Hussein (PBUH) along with his 72 followers as a symbol of resisting the injustice and oppression.
The police forces then removed all black clothes off the walls, a move considered highly offensive by the Muslims who later took to the streets both in Manama and villages of al-Malikiyeh and Sanabis on the city’s outskirts to protest the move.
The Bahrain Mirror news site reported that many suffered breathing complications following the attack.
Bahrain is faced with civil protests initially demanding equal rights for the Shiite majority. The protest was oppressed with iron fist by the ruling monarchy, although demonstrations continued demanding removal of Al Khalifa dynasty.