AMMAN - Dozens of people were feared dead or wounded after a car bomb exploded on Thursday at a petrol station in the Syrian capital Damascus, opposition activists said.The petrol station was packed with people lining up for fuel that has become increasingly scarce during the country's 21-month-long civil war, the activists said.The bombing took place in the Barzeh al-Balad district, whose residents include a mix of majority Sunni Muslims and several other religious and ethnic minorities.