(Updated at 7:13 p.m.) At least four people were killed and 30 others were injured in the attack, according to Zalmai Ayoubi, the Kandahar governor's spokesman.

(Updated at 1:02 p.m.) At least 10 men were injured Tuesday when attackers targeted a private security company near the Kandahar Airfield, according to Zalmai Ayoubi, the Kandahar governor's spokesman.

Ayoubi said a car bomb detonated at the gate of the security compound and then Taliban militants infiltrated. Another blast then occurred inside the camp and a firefight ensued, he added.

It is not clear whether the blast was caused by a suicide attack, but an ambulance driver said the attackers were wearing suicide vests.

Afghan and NATO-led soldiers have secured the area, Ayoubi said. - Journalist Muhib Habibi contributed to this report