According to AFP:
Bahrain police on Friday fired tear gas to disperse Shiite protesters who took to the streets of the capital Manama chanting anti-regime slogans, witnesses said.
The demonstration coincided with the final football game in the Gulf Cup of Nations being hosted in the Sunni-ruled kingdom.
“Down (King) Hamad,” yelled protesters who attempted to march in small groups in the narrow alleys of central Manama, as riot police fired tear gas canisters and stun grenades, said witnesses.
Crown Prince Shaikh Salman bin Hamad Al-Khalifa
