More than 200 people protested for the second day on Thursday in the northern Afghan province of Takhar over a NATO raid that allegedly killed four civilians, officials said, DPA reported.
On Tuesday night, the foreign forces raided a house in Taleqan city, the provincial capital, and killed four people. Afghan officials said that at least three of the dead were civilians, but NATO said all those killed were insurgents associated with the Islamic Movement of Uzbekistan.
On Thursday, the protesters threw stones at the police headquarters in Taleqan and set fire to police buildings, Shah Jehan Noori, the provincial police chief, said. Police fired into the air to disperse the mob, he said.
"Three protesters were injured in the gunfire," said Faiz Mohammed Tawhidi, spokesman for the provincial governor.
The demonstration ended around noon Thursday, but heavily armed police and soldiers continued to patrol the city centre, residents said.
Thursday's incident came a day after around 3,000 villagers and residents of Taleqan took to the streets, chanting anti-US and anti-Afghan government slogans. They attacked government buildings and a German military base.
The security forces fired on protesters after they tried to overrun the German military base and police installations, killing 12 rioters and injuring more than 80 others. Two German soldiers were also injured.
The riot ended after President Hamid Karzai talked to tribal elders in the province and promised them a thorough investigation.