Afghan officials say a suicide bomber has killed six civilians at an air field in Kandahar, in the latest of a series of attacks in Taliban territory.

Kandahar police chief Abdul Razaq confirmed the bombing Thursday. He said the blast took place close to gate of the air field.

On Wednesday, Afghan officials said two bomb attacks in the volatile southern Helmand province killed at least 16 people.

In the first attack, a suicide bomber on a motorcycle killed 10 civilians and two police officers in the Kajaki district. More than 20 people were wounded in the blast.

Another attack took place hours later in the Nad Ali district. A provincial spokesman said an Afghan intelligence official, two of his bodyguards, and a fourth person were killed by a remote-controlled bomb.

The Taliban claimed responsibility for the second attack.

On Wednesday, the commander of International Security Assistance Force, U.S. General John Allen, condemned the attacks, saying they will “further isolate the Taliban from the process of peace negotiation.”

General Allen added that the “violence further confirms that the insurgency has declared outright war on the people of Afghanistan and will stop at nothing to continue to use terrorism and intimidation to advance their own malign and selfish ends.”