Published: Oct 16, 2010 8:04 PM EDT
Updated: Oct 16, 2010 5:04 PM EDT

KANDAHAR, Afghanistan (AP) - Afghanistan's main southern city has been rocked by a series of explosions.
      
Helicopters are patrolling above the Kandahar city while NATO and Afghan troops have been deployed to seal off the attack sites.
      
At least two civilians have been killed, while ambulances have been ferrying the wounded to local hospitals.
      
In one attack, a motorized rickshaw carrying explosives detonated behind police headquarters in the center of the city. Meanwhile, insurgents opened fire on an oil tanker on the eastern side of the city, causing it to explode.
      
Militants also fired a rocket into a prison compound in the city's west and a fourth explosion has been reported in the city's business district.
      
Nearly 150,000 international troops and 220,000 Afghan security forces have been fighting to gain control of Kandahar city against an estimated 30,000 insurgents. The city is considered the Taliban movement's birthplace.