A security official, speaking on condition of anonymity, said the blast took place in the 10th precinct of Kandahar city, situated approximately 500 kilometers (310 miles) southwest of the country’s capital Kabul, at around 04:00 p.m. local time (1130 GMT) on Thursday.
He added that two civilians were killed and eight others, including two policemen, sustained injures.
Meantime, spokesman for Kandahar provincial administration Zalmai Ayubi confirmed the blast, saying investigation into the incident is underway.
Insecurity continues to rise across Afghanistan despite the presence of some 130,000 US-led forces in the Asian country.
The United Nations announced on February 4 that 2011 was the deadliest on record for Afghan civilians. The death toll rose eight percent compared to the year before and was roughly double the figure for 2007.
Overall, 3,021 civilians died in violence related to the war and 4,507 were wounded in 2011. Of the deaths, the UN attributed 77 percent to militant attacks and 14 percent to US-led foreign troops and Afghan forces. Nine percent of the cases were classified as unknown.
MP/JR