KABUL (Agencies) - Two people were killed and dozens injured on Sunday as new demonstrations erupted in Afghanistan over the burning of Holy Quran in the United States, officials said. One person was killed and 18 others injured in what officials described as an accidental explosion that ripped through crowds of protesters in the southern city of Kandahar. Hundreds of people had taken to the streets to protest against the burning of Holy Quran in the United States presided over by pastor Terry Jones last month. Violent protests that began in the northern city of Mazar-i-Sharif on Friday have claimed the lives of at least 22 people including seven foreign UN staff. The protesters set ablaze a traffic police booth. Inside there was a gas bottle which exploded, interior ministry spokesman Zemarai Bashary told AFP, calling it accidental. Casualties were reported on Sunday at demonstrations in Kandahar city and the neighbouring districts of Panjwayi and Dand. At least one person was killed, a government official said on condition of anonymity, though it was not clear where the death occurred. Kandahar provincial govt spokesman Zalmai Ayoubi told AFP the situation was under control. Elsewhere, about 500 university students protested in the eastern city of Jalalabad and blocked a key road for several hours, while hundreds of men poured onto the streets in Charikar, capital of Parwan province, north of Kabul, local television reported. President Barack Obama on Saturday condemned the US pastors burning of the Holy Quran, after violent protests at what he called an act of extreme intolerance and bigotry left 17 dead in Afghanistan. Afghan President Hamid Karzai called on Sunday for the US Congress to condemn the burning of Holy Quran. Karzai made the request at a meeting with US ambassador Karl Eikenberry and General David Petraeus, the commander of US and Nato forces in Afghanistan, the statement said. General Petraeus said burning the Muslim holy book was hateful, it was intolerant and it was extremely disrespectful and again, we condemn it in the strongest manner possible. Ambassador Mark Sedwill called the burning of Holy Quran by a small Florida church an act of disrespect to the Muslim faith and to all peoples of faith. It does not represent the views of the peoples or governments of the alliance.